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00:09music
00:11music
00:11music
00:14music
00:30I'm Francis Bourgeois, and I love trains.
00:33Oh my God, oh God, it's such in my mouth.
00:36I've roped in my petrolhead pal, Chris Harris, for an epic project.
00:41That's impressive.
00:42Rescuing a dilapidated locomotive.
00:44This isn't a quick fix.
00:45No shit, Sherlock, look at the size of it.
00:48Francis hooked me with engineering.
00:50That is the coolest kilometre ever fitted to a machine, look at that.
00:54Then blew me away with weapons-grade enthusiasm.
00:58Nice one, Danny.
01:01And I'm all in for a restoration race against time.
01:05She just rolls beautifully.
01:07Yeah, seven tons.
01:08We've just six months to fix this loco to replace her failing sister.
01:13We have to get this locomotive ready for when she needs to come off.
01:17It's race against time.
01:19This is British industry.
01:22My dream is to see her back on the railway.
01:25I feel like an infant reattaching to its mother's teeth.
01:28Mine.
01:29I mean, I can live vicariously through you.
01:31Just to witness that moment.
01:35Brilliant.
01:36Absolutely brilliant.
01:49It's a huge moment in our restoration.
01:52With the wheels finally fixed and back at the depot,
01:56it's bogey assembly day.
02:05As 37-025's bogeys are so ginormous,
02:09a much easier way to visualise their functionality
02:12is to see them in miniature.
02:22It's 37 heaven here.
02:24These people know their shizzle.
02:28Are these all yours, guys?
02:30Yeah.
02:30I don't have club locals yet.
02:32Lovely to meet you.
02:34Chris, Cliff and Colin run the biggest little attraction at Bowness.
02:39Their stunning O-gauge model railway
02:41even has a 37-025 with sound.
02:46Oh!
02:48Oh!
02:51I thought that was the loco doing some horns, then,
02:53but it was actually Chris.
02:55I want one of these.
02:57This model railway was actually subject
02:59to quite a significant bout of vandalism.
03:02It was a break-in,
03:04and then they set fires in this part here.
03:07It just seemed so disheartening
03:09that they want to take out their anger on
03:11such a lovely hobby.
03:14We had a brilliant public response to that.
03:18An online campaign raised 35 grand,
03:21and unlike our restoration,
03:23this revival is almost complete.
03:26So how did you all get into the model railway?
03:29Just rekindling some memory from your childhood, really.
03:32Yeah.
03:32You guys might have actually seen these in their heyday.
03:36We did, that's it.
03:36I met some of the youth group here.
03:40The memories they're making with diesel locomotives
03:43are in a heritage sense.
03:45They've just existed in a different timescale
03:47in someone else's lifelong enthusiasm.
03:49You see it in the present,
03:50but actually you see the equivalently aged human being,
03:54and they're all wrinkly.
03:57Oi!
03:58I know.
03:59Look around you here.
04:00Look around you here.
04:00Look around you here like me.
04:02I'm back close to the bone.
04:04I could talk about the longevity of 37s all day,
04:09but we are here to discuss bogeys.
04:11We have our wheel sets,
04:14but then on the flip side
04:16is where the traction motors would be situated.
04:20And you have your brake blocks here,
04:22and these are the little brake cylinders.
04:24Brake cylinders.
04:25When you're hearing the...
04:26That's that pressure.
04:28That's this, yeah.
04:29And then it's articulated by this central point.
04:33But yes, this is wonderfully detailed.
04:35It's very compact, isn't it?
04:37It's a cassette,
04:38and it contains all of the components,
04:41and then it bolts into the train.
04:44Back in the day,
04:44they wouldn't be stripping it apart
04:45and rebuilding it.
04:47They've got a set of bogeys ready to go.
04:49The local would come in,
04:50disconnect it,
04:51lift it up,
04:51lift it off,
04:52new bogeys in,
04:53and out the door.
04:54Like a pit stop.
04:55Basically a pit stop, yeah,
04:56a Formula One pit stop,
04:57but maybe slightly longer.
05:00I can tell Chris's fascination is developing.
05:03He's drawing similarities from his world to mine.
05:06I can see the merits in both.
05:09I love it.
05:10I can't wait to see his face
05:11when you get some 37.025.
05:12And here's the noise.
05:14That's going to be quite some.
05:17With our little hors d'oeuvre out the way,
05:20it's time for our main course of giant engineering.
05:24Hi, Stuart.
05:25Hiya.
05:26So this is the big day,
05:28the day of bogey assembly.
05:30Yep.
05:30Stuart, a.k.a. God,
05:32is all-knowing when it comes to bogeys.
05:35So we've got to get this frame lifted up,
05:37put the crane in place,
05:39onto the three wheelsets.
05:40Before we can put the wheelsets under,
05:42we need to assemble the equalising beams
05:43that go between each wheelset
05:45and put the springs on top of the beams.
05:47And then the whole lot rolls under here
05:49and we have to get the six axle boxes
05:52into the six guides all at the same time.
05:54Did he capture that?
05:56Sort of.
05:57Come on, where do we start?
05:59Our first job is to install equalising beams
06:02between the wheelsets.
06:04Swing it right across.
06:06Well, that's pleasing.
06:07Yeah.
06:08That is pleasing.
06:11Leave that suspended.
06:12Yeah.
06:13And roll this wheel down.
06:14Have you ever done this before?
06:15No.
06:16This is like me building a Ferrari V12.
06:18I'm not saying it isn't meaningful for me,
06:20but for you, this is life-affirming stuff.
06:23The multi-stage assembly starts with us guiding the beams
06:27into the hangers on the axle boxes.
06:32Down a bit more.
06:35In she goes.
06:36Oh.
06:37Right, perfect.
06:38Oh.
06:38It's just Meccano.
06:40With really heavy bits, isn't it?
06:423D jigsaw.
06:43You can see why everyone comes here
06:46after a long working week.
06:48It is just a bit of kind of play in a way.
06:52The next rolling component
06:53is the wheel set
06:55that caused us so much trouble in Devon.
06:57Right.
06:58Right.
06:59There you go.
07:00Our two-wheeled problem child
07:02holds the other end of the respective beams.
07:06That needs to be halfway there
07:08because the other equalising beam
07:09is going to meet it in the middle.
07:11Yes.
07:12You're showing off now, Francis.
07:15I'm loving this.
07:17What is actually the purpose
07:18of the equalising beam?
07:20The weight gets transferred
07:21from the bogey to the wheel sets
07:23across the four springs.
07:24Yeah.
07:25Spreads the weight from the four springs
07:27across the six wheels.
07:28It means you don't have to have a spring
07:29mounted where the axle is as well.
07:31Yeah.
07:31There's a spring per axle on Class 56s.
07:34Which is another way of doing it.
07:35Yeah.
07:35That's why they look so pornographic.
07:39That's...
07:39Yeah.
07:40Come on.
07:40Well, what's your favourite bogey?
07:42It's definitely not a 56 bogey.
07:43Definitely not?
07:44No.
07:44Don't you just love
07:45how it kind of sounds
07:46like metallic maracas?
07:48No.
07:50There must be a middle ground
07:52that we can come to
07:53in the depot
07:54about favourite bogeys.
07:55Anyone?
07:56Finished.
07:58I think that means
07:59get on with it.
08:00Right, come on, Francis.
08:01We didn't really reach
08:02a bogey consensus.
08:04Maybe next time.
08:06We'll get the other view up.
08:07You got it.
08:08Yep.
08:09There she goes.
08:13Whew.
08:15Now, look at that.
08:16That starts to look
08:17like a locomotive now.
08:18Next stage,
08:19fit four spring carriers
08:21for 16 suspension springs
08:23to sit on.
08:27We in?
08:28Spot on.
08:29It's a model kit, isn't it?
08:30It's a model kit.
08:31Now the springs.
08:33Now put the biggie on top.
08:35Yep.
08:35Oh, crikey.
08:40Look at that.
08:44It's much easier
08:45than a car.
08:46Suspension, done.
08:49Next job,
08:50get this up in the air.
08:54We'll get the wheels
08:54rolled underneath.
08:55That is a proper crane, Stuart.
09:00Yeah, that's a big old
09:00piece of kit.
09:01That's massive.
09:02Yep.
09:03I wouldn't fancy
09:04being in control
09:05of that beast
09:06when we lower
09:06four tonnes
09:07onto some springs.
09:09But I know a man
09:10who would.
09:11Come on, crane man.
09:13Up, down.
09:15Right, left.
09:19That echo sound
09:21is a bit like
09:22when they're in
09:22the compactor
09:23in Star Wars.
09:24I can't say
09:25I know that one.
09:26You don't know Star Wars?
09:27Well, I do,
09:28but I don't know
09:28what you're referencing.
09:30You know when they're
09:30in a compactor
09:31and the walls
09:32are coming together
09:33and there's that
09:34massive worm thing
09:35that's trying to
09:35eat them.
09:37Oh, my God.
09:38Stuart, help me here.
09:40I don't remember.
09:41Oh, come on.
09:42Different field of interest.
09:44How old is that lift?
09:46No idea.
09:47We bought that off eBay.
09:50No.
09:52There's a guy selling
09:52a load of them.
09:53Right, shall we push
09:54the wheels under?
09:55Yes, please.
09:56Ready?
09:57OK.
09:59Oh, look at that.
10:02She just rolls
10:03beautifully.
10:04Yeah.
10:07This just exemplifies
10:08why the railway
10:09is just so efficient.
10:11This weight
10:12with this little friction
10:13is amazing.
10:14Yeah.
10:15About five tonnes.
10:16Six or seven.
10:17Six or seven tonnes.
10:18And we're just rolling it.
10:19I know.
10:20That was beautiful.
10:22And now for something
10:23completely different.
10:24All right.
10:26The only thing
10:27that holds
10:27these suspension springs
10:28in place
10:29is a frame
10:30that weighs four tonnes.
10:32Bring it, though.
10:33Lower it too fast,
10:35damaging the springs,
10:36and we're in big trouble.
10:38Over to you, Francis.
10:40Crikey, OK.
10:42All right.
10:44All right.
10:57Coming down.
10:59I'm lowering
11:00a four-tonne frame
11:01towards our bogey's
11:03suspension springs.
11:04OK with that.
11:06Lining it up perfectly
11:07is a delicate operation.
11:11Stop, stop, stop, stop, stop, stop, stop, stop, stop, stop, stop, stop, stop.
11:18How far out is that?
11:19There's nowhere near.
11:21It's like the way
11:22that Stuart basically
11:23roams around
11:23with a massive iron bar.
11:27Clear to come down?
11:28Yeah.
11:29Clear, yeah.
11:29Coming down.
11:32Bloody hell.
11:33Right.
11:34Take it up slightly.
11:35Yeah.
11:38The sensitivity
11:38of the buttons
11:40is...
11:40I'm very glad
11:41that you're doing
11:42this lift work,
11:43not me.
11:43Right, OK.
11:44It's coming down.
11:45You press it up once,
11:46it just drops.
11:46Wheel problems
11:48set our restoration
11:49back weeks.
11:50If this drops
11:51too fast,
11:52I could set us
11:53back months.
11:54Everyone clear?
11:55Yes, yep.
11:57Like it.
11:59Look at that.
12:00Woo!
12:01A bit more.
12:02Yep.
12:03Yep.
12:05Yes.
12:07Hallelujah.
12:09Honestly,
12:09when I did
12:10the bit too much,
12:11I saw so many
12:12faces
12:13looking at me
12:14in a way
12:15but I didn't want
12:15to see you,
12:16that was a risky move.
12:18You look as if
12:18you've seen a ghost.
12:21That was fine.
12:22It's fine,
12:23it was all right.
12:23That was fine.
12:24But we're not finished.
12:26Get all those
12:26packing plates in.
12:27Job done.
12:30The springs assembly
12:31isn't complete
12:32until metal packing plates
12:34have been installed,
12:35which means someone
12:36has to lift the frame again.
12:39Do you want to do
12:40the controls next?
12:41I would absolutely
12:43rather go outside
12:44to take my boot off
12:45and my sock off
12:46and kick a wall.
12:49I think that's a no.
12:51Maybe not then.
12:53Fine.
12:55Let's get in there.
12:57Just use that
12:58to line it up,
12:59and then just drop it down.
13:03Here we go again.
13:08Job done.
13:10Well done, boys and girls.
13:11Well done, chap.
13:11Well done.
13:12Happy days.
13:13Amazing.
13:13No bolts,
13:14no fittings,
13:15just four tons of frame
13:17holding everything in place.
13:18Very clever design.
13:21A Class 37
13:23sits on two bogeys.
13:26While Chris and I
13:27were wrangling wheels
13:28and raising funds,
13:30Team Bowness
13:31were busy completing
13:32bogey one.
13:36Bogey two
13:36is well behind schedule,
13:38so to come so far
13:40in a morning
13:40is a blessed relief.
13:43Let's get a group picture.
13:46Boogies.
13:47One, two, three.
13:49Boogies.
13:51In three months,
13:52our loco's sister engine,
13:5537403,
13:56comes off the rails.
13:57We're playing catch-up
13:59to finish its replacement.
14:01What does that weigh
14:02all in now?
14:0311 or 12 tons.
14:0412 tons?
14:05So far.
14:06So far?
14:07Still got the motors to go in.
14:09Traction motors,
14:10the spider?
14:11Yeah.
14:12And then brakes.
14:14The brakes, yes.
14:14They're quite handy.
14:17And brakes
14:18are the one aspect
14:18of bogey assembly
14:19that I can't wrap
14:20my head around.
14:23If only I knew someone
14:24with a whiteboard
14:25and a penchant
14:26for long-winded lectures
14:27about railways.
14:30I'm especially excited
14:31about this one
14:32because braking
14:33doesn't make sense
14:34to me in this train.
14:35OK.
14:36In heavy goods vehicles
14:37and buses,
14:38the default position
14:39for the brakes
14:40is that the caliper
14:41is locked against the wheel.
14:42Yes.
14:42When you hear
14:43all that hissing,
14:44that's actually trying
14:44to keep the caliper
14:45off the brake disc.
14:46And if anything fails,
14:48everything just automatically
14:49returns to a default
14:49lock position.
14:50I would have thought
14:51this would mirror
14:53a heavy goods vehicle
14:54system by being
14:56constantly on
14:56and requiring pressure
14:57to release,
14:58but that's not the case.
14:59No.
15:00Whilst vacuum braking
15:01has been used
15:02on the railway,
15:03a pressurised air brake
15:04system is more responsive,
15:06applies greater braking force
15:08and maintains the fail-safe
15:10of the brakes applying
15:11if there are pressure issues.
15:13When we have started
15:1637403, for example,
15:17before,
15:18one of the noises
15:19that you hear
15:19straight away is
15:23that's the compressor.
15:25This is what compresses
15:26the air, obviously.
15:28It feeds in
15:29to
15:33the main
15:36air.
15:38Res
15:40air.
15:42Voir.
15:43Yeah.
15:44French.
15:45Potentially.
15:46Not unlike your name.
15:48Reservoir.
15:49Yeah.
15:49Reservoir bourgeois.
15:51Then this feeds
15:53into
15:55where the driver
15:56applies the brake.
15:58Right, so that's,
15:59OK, that's actually,
16:00he's on the throttle
16:00lever there.
16:02Yeah.
16:03Nice seat.
16:04Pedestal.
16:04Yeah, I like it.
16:05So, the driver
16:07is applying the brake
16:08here,
16:08which is ultimately
16:09controlling
16:10the pressure
16:11pressure in the main
16:12air reservoir.
16:13So, this feeds down
16:15into a control valve
16:17here.
16:18Before that,
16:19there's a
16:20an aux
16:24air
16:24tank.
16:26This is,
16:28crucially,
16:29the control valve,
16:34and this is
16:36the brake
16:38valve.
16:40Now, the control valve
16:41regulates the pressure
16:43on one side
16:44and equates it
16:45proportionally to the
16:46amount of braking force
16:47required to go
16:49into
16:52the brake
16:53cylinder.
16:55And very simply,
16:56this is attached
16:57to a little
16:58thing here,
17:00and then the shoe
17:01that is in contact
17:02with the edge
17:03of the wheel.
17:05This is easily
17:06your most succinct
17:07piece of teaching
17:08so far,
17:09but this is all
17:10very complicated.
17:11Well, with a load
17:12of pulverized
17:13chickpea fuel,
17:14I know a way
17:15to physically
17:16demonstrate how
17:17the brakes work.
17:22That was a third
17:23of a tub
17:23in one mouthful.
17:27It's so good!
17:29Very good.
17:30What's left of it.
17:34A practical brake
17:35demo is out
17:36of the question
17:37in the depot.
17:40Where are we going?
17:42Right.
17:43Outside, on the
17:44other hand,
17:46I present to you
17:56this is
17:57We Inver.
18:05We Inver.
18:07Because it's
18:08Inver.
18:09Nest, TMD,
18:10but we.
18:11We Inver.
18:11I like it.
18:12I'm hoping
18:13it's a static object.
18:15No.
18:15This moves.
18:16Yes.
18:17Is the expectation
18:17that I'll be moving
18:18with it?
18:19Yes.
18:20So,
18:21I know I've explained
18:22how the braking
18:23system works
18:24on a whiteboard,
18:25but we can see
18:26it here
18:27in practice.
18:28There's no substitute
18:29for seeing things move.
18:30Exactly.
18:31Come on,
18:31let's see it.
18:31So,
18:32just like
18:33the real
18:33Class 37,
18:35we have a compressor
18:36that feeds air
18:38into a main air
18:39reservoir,
18:40and when actuated,
18:48it's really good,
18:49this.
18:50That's,
18:51I mean,
18:51that piston
18:53coming out like that
18:54is just...
18:56Everyone,
18:57every young kid
18:58needs to see this
18:59so they understand
19:00how it works.
19:01Yeah.
19:02Shall we have a go?
19:02How quickly
19:03will it stop?
19:04That's what we're
19:05here to find out.
19:07Are you okay
19:08being on second man
19:09duties?
19:10Yes,
19:10you tell me
19:11what I have to do.
19:11Chris,
19:12please may you
19:13check the
19:14tail lamp for me?
19:20Tail lamp flashing.
19:22Do you mind
19:23checking the
19:23headlights as well
19:25for me,
19:25please?
19:29Headlight on
19:30but not
19:30impressive.
19:32Okay.
19:34Can you just
19:35check the
19:35horn's working
19:36as well,
19:36please?
19:40Yep.
19:41Now we've done
19:42all the testing,
19:43we can get this
19:44puppy fired up.
19:48I can do this,
19:49but...
19:50Okay.
19:50Turn the feed
19:51to the...
19:52Have you driven
19:54it before?
19:55No, I haven't.
19:57Okay.
19:58You've not had a little
19:59go at practice?
20:01Nope.
20:03Have you ever
20:04started it before?
20:14just turned the compressor on.
20:20Just turned the compressor on.
20:20Just turned the compressor on.
20:20jumps to a horn.
20:24whew.
20:25Ha, ha, ha, ha, ha, ha.
20:34Lucky hell,
20:35that's quite lively.
20:36Ha, ha, ha, ha, ha.
20:40Ha, ha, ha, ha.
20:42Ha, ha, ha, ha.
20:45Ha, ha, ha, ha.
20:53That's plenty fast enough for me, oh my god.
21:10Right, I've brought us to a halt at this location as there's a home
21:16signal and if the home signal is displaying a stop aspect we would need
21:23to guide our rail vehicle to a halt before the signal. I think it would be
21:28fun to maybe imagine that we have a red or a stop aspect here and we need to
21:34bring our vehicle to a stationary position as close to the signal as possible.
21:48Brake, brake, brake, brake, brake, brake, brake, brake.
21:53Woo!
21:57OK. Four, five, six, seven, eight, nine. Nine sleepers from the signal.
22:05Happy with that? Happy.
22:07Yeah, good.
22:08Now it's your turn. Let's go.
22:10Somehow this is more nerve-wracking than stopping a Valkyrie AMR Pro from 200 miles per hour.
22:17It's metal on metal.
22:27Eight, nine, ten, eleven.
22:32Eleven!
22:33Nine, ten, eleven.
22:35It's the same on this side as well.
22:40Anyway, Chris.
22:41Fine.
22:42I may have overcompensated for the total absence of rubber.
22:46If you're going to beat me at anything, a braking challenge is the one to be beaten out,
22:49I think.
22:50I'll take that.
22:51Not quite supercar stopping, but 12 miles per hour to zero in six seconds
22:56is a world best in the crazy railway go-kart category.
23:02I've enjoyed that.
23:03Yeah.
23:04Now what?
23:05Er, we can reverse back to the depot, maybe.
23:08We have to reverse all the way back.
23:09Can't we turn it around up there?
23:10Er, no.
23:12What?
23:17I can't see.
23:36It'll take many hands a week to assemble the brakes in bogey, too.
23:40And we're mucking in, stripping brake lines for repainting.
23:47With around six metres of steel brake lines in each bogey,
23:51we have a lot of old paint and rust to grind before reaching bare metal.
23:56But it's therapeutic work.
23:58Let's have a look.
24:00That looks not bad.
24:02Ah, you can come again, lads.
24:05We can then turn it over and get the underside done.
24:09We're looking at 45 minutes of noisy graft to get these lines ready for primer and paint.
24:15And I'm aiming to be top of the podium for coverage.
24:22So I would say in the grand prix of grinding, I think you've actually come first.
24:27Ah, you see?
24:29At the end of the day, it's a team effort.
24:31It certainly is.
24:32Every grind counts.
24:33And crucially, our effort means these pipes are ready to paint.
24:39Get some primer on that.
24:40In colour-coded white.
24:43So white is air.
24:45Yep.
24:45Orange is electricity.
24:48Yep.
24:48Blue is...
24:49Water.
24:49Oh, water.
24:51Pipes, hoses and cables are colour-coded to speed up maintenance, fault finding and safety checks.
24:58Speaking of which, our next job is a brake test on bogie one.
25:03The white means air.
25:04Yeah.
25:05Where we'll be willing support for Isla and Stuart.
25:09So, we get it up to the maximum pressure, plug in the pressure gauge and see if it's holding pressure.
25:17You're only allowed a certain amount of pressure drop.
25:20This started at 72, it's now at 63 psi.
25:23There's a leak somewhere.
25:25Finding an air leak in all this pipe needs specialist tools.
25:29Did you ever know that that existed?
25:31Leak detection spray.
25:33What is it exactly?
25:34It's soapy water.
25:35Is it really?
25:36That's all it is, yes.
25:38Armed with soapy water, sorry, leak detection spray, the hunt is on.
25:43Anything with a nut, we test.
25:47Nope, nothing there.
25:48We're looking for soap bubbles caused by escaping air.
25:52Nope.
25:54You can see the thread on this one, I wonder.
25:56Ooh.
26:00There, look, the bubble underneath.
26:01Ooh!
26:02There you go.
26:04Span up.
26:05Go on, give it a crank.
26:06Yep, that's definitely a bit loose.
26:11Right.
26:12Let's check numbers.
26:13It's a lot slower.
26:13It's a lot slower, but it's still leaking.
26:16It's still leaking, yeah.
26:17There's another one somewhere.
26:19Is there a chance it's one of the inside nuts?
26:22Could be.
26:23When not volunteering here, Isla is at uni, studying mechanical engineering with aeronautics.
26:29You're going to have to see if this bubbles.
26:32Which might prove handy.
26:35Anything on that one?
26:36Don't see anything there.
26:39Ooh, there we go.
26:41There we go.
26:42Oh, big bubble.
26:42Bingo.
26:43How do we tighten that up?
26:44Righty tighty, lefty loosey.
26:46There could still be multiple leaks, so we don't want to risk over-torquing individual nuts and damaging pipes.
26:5684, 80, it's going slower.
27:00Which means an ongoing game of gauge checking.
27:04It's slowing down.
27:05And bubble hunting.
27:07Ooh, ooh.
27:09And careful tightening.
27:10Do you want a bigger spanner that's got more leverage on it?
27:13Er, yeah.
27:14A leak could cause the brakes to lock on, so the tolerance is tiny.
27:191 psi in 15 minutes.
27:22A drop more than 1 psi in 15 minutes, and it fails.
27:2615 minutes?
27:28Ooh.
27:29Oh, that's miles off.
27:31We're dropping 4.5.
27:33If we can't fix that today, it'll be a week before enough volunteers are available to try again.
27:39Is there a way we can isolate this?
27:42No.
27:43We need to know if this is the last leak.
27:48We could maybe calculate the volume of the bubble.
27:53Go for it.
27:55Try and measure the diameter.
27:574 pi r squared.
27:58No, 4 pi r cubed, is it?
28:004 over 3 pi r cubed.
28:024 over 3 pi r cubed.
28:04Anyone else know?
28:06But I think you're correct.
28:07I graduated from my degree three years ago.
28:11For you, it's a little fresher in the mind, I suppose.
28:13Just a little bit.
28:15Calculate bubble volume, work out flow rate, confirm this against our measured pressure change, and determine if this is our
28:22last leak.
28:24We've got to close this off.
28:25Are you going to start measuring bubbles now?
28:27Yup, he is.
28:28Right, but I need to time the moment from the bubbles' inception.
28:34That was 15 seconds of a bubble, and we're looking at...
28:382 centimetres.
28:402.5 centimetres.
28:42So, 2.5 centimetres in diameter in 15 seconds.
28:53Whilst the bubble whisperer is over there doing his maths homework, you're actually getting this done. I like this.
28:59Go on. Go on, go!
29:02Now that's moved.
29:04How are you getting on bubbles?
29:05So, I've worked out the flow rate of the bubble leak is 5.45 times 10 to the minus 7
29:16metres cubed per second.
29:19But then how do we go from pressure change to flow rate?
29:23Mass equals density, speed, area.
29:28Are you two related?
29:30Because you actually sound like him.
29:32I'm going to say that as a compliment.
29:35Oh, you've actually got your calculations. You've done your work as well.
29:38And I've done my assumption at the top as well.
29:39Assumption bubble is an...
29:42It's an un-intruded sphere.
29:45But I've worked out the flow rate of the leak.
29:51Which is 5.45 times 10 to the minus 7 metres cubed per second.
29:58What does that mean to you?
30:02It means it's still leaking, isn't it?
30:06Big spanner.
30:07The data points towards this being our last and only leak.
30:12Right.
30:14There's literally no more bubbles under here.
30:16Good.
30:18OK, the moment of truth.
30:20Are we below max tolerance of one PSI drop every 15 minutes?
30:25OK, calculations.
30:27So, 0.05 PSI in one minute.
30:31So...
30:320.75 every 15 minutes.
30:40Do you want me to go in and get that?
30:41No!
30:42No, let's just relish in the moment.
30:46I'm really sorry.
30:47Well done.
30:48Thank you very much.
30:49You too.
30:51What an end to the day.
30:52Bogie 2, ready for the rails.
30:54It's just a shame that I launched Francis' phone into it.
30:59Was it already cracked like that?
31:02Oh!
31:06It smashed quite badly.
31:08Can you see these slightly ferrous filings?
31:11It's got Class 37 DNA embedded in it now, so is it more valuable to you now?
31:17I think it has another story, another chink in its armour.
31:21So, thank you, Chris.
31:22Such positivity, I like that.
31:24Yeah.
31:27I've got something else planned that Chris should like.
31:30A treat that's perfect for lovers of road and rail.
31:35Right, I'd recommend getting to bed soonish.
31:38I know you don't like surprises, but I've got something arranged for us tomorrow morning.
31:42OK.
31:44It won't be a tickle fight.
31:46Again.
31:47Night, Francis.
31:52Tickle fight.
32:02I've chased trains to some wonderfully picturesque locations.
32:10The emus are making a racket, as are the 97s.
32:19And to celebrate a successful bogey assembly and brake test, this morning I'm taking Chris to one of the most
32:26stunning locations of all.
32:28Right.
32:32So, welcome to Loch Il.
32:35Looks like the set of deliverance to me at the moment, mate, I had to say.
32:39Well, it's about to get better as we're putting on high-vis.
32:44I used to have a man deliver me sushi to Dunfold to the Top Gear test truck. I'm now lacing
32:50up a safety steel toe-cap boot, clearly bought at a service station last night by the crew, on the
32:58passenger seat of a Renault van.
33:01Hashtag fallen.
33:04Do you notice I'm not even asking what we're going to be doing today, because it's going to be something
33:07so random.
33:08The reason why I thought this experience would function better as a surprise is that, you know, we've involved ourselves
33:14so much in my sort of vehicle.
33:17Oh.
33:18I thought that we'd, erm, go more into your kind of vehicle.
33:24Ooh, now we're talking, okay, you've got me, you've got me.
33:26Yeah.
33:27I'm thinking something Scottish, an Argyle GT Turbo, a Raptor, maybe a cute little Hillman Imp.
33:39Chris.
33:40What?
33:42Ta-da!
33:44Good Lord.
33:46This is an Isuzu network rail response unit.
33:50Well, consider me underwhelmed.
33:53You can barely see what's underneath it. There's an Isuzu under there somewhere, isn't there?
33:57And inside it is our driver.
34:00Hey, mate, I'm Chris.
34:01Hey, Chris. Gary.
34:02What on earth are we doing?
34:10All right, so, a real network rail vehicle.
34:16So, we're going to go off-roading and look at a rail head.
34:19Oh, well, I think you're on the right track in saying we're going off-road.
34:28Is this normal?
34:32We're about to drive on the railway.
34:34Have you done this before?
34:35Never.
34:37This is cool.
34:39This is cool as.
34:44Go on, Gary.
34:49Oh, he locks his steering wheel off.
34:50Oh, this is ridiculous.
34:53Steeringless.
34:53Elon Musk eats your heart out.
34:55Zero nine, Bannerby North, Gary Max.
34:57No deal.
34:57Now on track.
35:01I have done most things in a car, but I've never done this.
35:11Oh, this is wild.
35:14This is wild.
35:15This is making me have a mental misfire at the minute.
35:20Wow.
35:22Network Rail has hundreds of road rail vehicles.
35:25Most are propelled by the tyres directly touching the track.
35:28The tyres are only just in contact with the rail.
35:33Enough friction to drive and enough friction to brake.
35:36So the braking is still done through the road wheels.
35:38They're still in contact with the rail head.
35:40So you still brake and accelerate like a normal car.
35:43But obviously the rail wheels guide you along the track,
35:45so you're just maintaining the speed maximum is 20.
35:47You don't want to go any more than 20, do you?
35:50No.
35:50You really don't.
35:5220 is plenty.
35:53Yeah.
35:56I've never seen one of these driving on the tracks from a car.
36:01This type of vehicle, I've only seen operate in the Highlands.
36:05West Highland Line, there's a lot of where the track goes,
36:08there's no road access.
36:09We can access incidents far easier.
36:12And we also use it for patrolling.
36:14So after like a storm, we'll go out with chainsaws,
36:17clear the line of any trees that have fallen.
36:19To keep trains running in tough terrain areas like the Highlands,
36:23Network Rail's road rail vehicles include excavators, cranes,
36:28and mobile platforms.
36:30I've chased many Class 37s down this way.
36:34I bet I.
36:35Yeah.
36:36There's one kick in the boat, did he?
36:38Ooh.
36:40He's happy now.
36:42That makes two of us.
36:44Oh, this is beautiful.
36:46Look how old that is.
36:48Fabulous.
36:49This is a very, very, very special treat.
36:53Well, I feel very, very spoiled.
36:57Oh!
37:00Look at that!
37:02Oh, wow!
37:04So you may know this bridge, Chris, from Harry Potter.
37:17This is stunning.
37:19But even the boy wizard didn't get to walk on it.
37:22This is absolutely magnificent.
37:27Well done, you.
37:28Oh, thank you.
37:30One day I'll have to reciprocate and take you on a car journey,
37:32which will never match this.
37:34Best spot I've ever been to for a selfie in my life.
37:37It's not too bad here.
37:40Isn't this just bonkers?
37:43I've done some things in my time.
37:45I've been so lucky, but this is right up there.
37:49Look at it down there.
37:51Yeah.
37:54See those people up there?
37:56They've come to see the Glen Fennan Viaduct
37:58due to its feature in the Harry Potter films.
38:02And they've got a double whammy
38:03because they're also seeing a network rail response unit.
38:07Or are we just ruining their photograph?
38:09No.
38:09You sure?
38:10Yeah, yeah.
38:11Hello!
38:15Look at this, Francis.
38:17Look at that view down there, down the loch.
38:20Oh, this is just stunning.
38:23Now, let's have a look up close at these rail heads.
38:27So that's for your expansion and contraction when the weather,
38:30obviously, and each one has that gap.
38:33How do they keep it so accurate?
38:35It's just the distance.
38:371,435 millimetres between here and here.
38:43That's a standard gauge.
38:441,435 is a significant number for you, isn't it?
38:48Absolutely.
38:48Is it like pi for you?
38:50Oh, yeah.
38:51Now you've got me going.
38:573.141592653589793238462.
38:58That's as much as I can remember.
39:07OK, that's...
39:08I need to retire now.
39:10He's just recited pi to about 13 decimal places
39:15and then did an accidental blow-off
39:17and walked away because he knew he'd done it.
39:20I guarantee no-one has ever done that.
39:22No, no-one's ever done that before.
39:24An accidental flabby woof-woof after...
39:27How many decimal points was it?
39:2921.
39:292021.
39:32Quick.
39:33Change the subject.
39:34No-one noticed.
39:37I've stood there numerous times waiting to see 37409, 37676 and 45407.
39:47Those are the occasions that I've seen locomotors pass over here.
39:51Would you rather see a Class 37 or a steam engine come over here?
39:55A Class 37.
39:57Would you?
39:57The tourists want to see the steam engine.
39:59I want to see the 37.
40:02I don't know how I'm going to repay you for all this.
40:04The last few months have been back-to-back special moments.
40:10Well, that's the thing, Chris.
40:11It's...
40:11This is a...
40:13You know, it's a bit of fun, really, for us.
40:17Because we've been working hard, you know?
40:21I finally understand Francis' love of the railway.
40:25I've fallen for it, too.
40:28Extraordinary.
40:35You're distracted by the fact there is one lurking, isn't there?
40:38Yeah.
40:40We're on our way back to Bowness,
40:42but the Boy Wonder can't get over a possible Class 37 in the wild.
40:47And an undercover 37 at that.
40:50The fact that it's on a VSTP path,
40:53which needs very short-term planning,
40:55as soon as it runs out onto the line on line-proving duties.
40:59It doesn't go on a publicly-advertised headcode.
41:03Ah.
41:03Called in last minute to test the line after snow,
41:06this loco is for eagle-eyes only.
41:09If this particular Class 37 was in a Bourne movie,
41:12would it have gone dark?
41:14Yeah. It's flying below 50 feet.
41:16Is it?
41:17A dark 37.
41:19No intel.
41:21What hope is there?
41:22Thankfully, I'm sitting behind a gentleman called Gary,
41:25who works for Network Rail.
41:27Good point, Agent Orange.
41:30He does. Gary knows.
41:35Gary gave up everything under interrogation.
41:38Activate the asset.
41:40I like this game.
41:42I hear it.
41:44Do you?
41:45Yeah.
41:47How far away is it?
41:48Half a mile.
41:49I can't hear a thing.
41:57Yeah.
42:01Here it comes.
42:02Here it comes.
42:10Oh, yes.
42:19Freshly painted as well.
42:21Go on, give it a bit of welly.
42:34Yeah.
42:37Lovely colours.
42:44Well, that was very, very lovely.
42:46It's on a line-proving run,
42:49in anticipation of poor weather.
42:51The Class 37s are perfect for working highland routes like these.
42:55The treacherous conditions, the trees, the slippery rails.
42:59It's what the Class 37s are built to overcome.
43:01For the first time since we started this project,
43:04that's the first time I've seen one working.
43:07Yeah.
43:08On the main line.
43:09Because that's the working train there, wasn't it?
43:11Yeah, yeah, yeah.
43:12Network Rail have paid for that locomotive to go on the main line
43:17and to just prove, make sure that the line is safe to run.
43:21025 might well be in that position in the future.
43:25Precisely.
43:33If you can see it.
43:40Yeah.
43:41Yeah.
43:47Are you alive?
43:50It has a great, great line.
43:50Yes, sir.
43:51Yes.
43:53That's beautiful.
43:54Does anyone have a great game?
43:54Do you know who you are?
43:54Do you know where you be?
43:54Do you know where you are?
43:54Do you know who they are?
43:55Do you think you are a big part of the game?
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