Gefilmt am 30.03.09 beim Rangierbahnhof Köln Gremberg in der Nähe des Stellwerkes Gnf. Zwischen Rbf Köln Gremberg und Gbf Köln Kalk Nord.
Filmed in the Cologne - Gremberg marshalling yard near the gantry - style signal tower "Gnf Gremberg". Gnf = Gremberg Nord Fahrdienstleiter ( Gremberg North Dispatcher).
At the short (ca. 1 Km long) connection line between the Freight Station Cologne Kalk North and the Shunting Station Cologne Gremberg. The freight station Kalk is behind the curve where the two Mak diesel-swichers are coming from and the shunting station Gremberg is where the gantry style signal tower stands.