ट्रेन पर क्यों लिखा होता है यूनिक कोड, क्या होते हैं इसके मायने _ Know Everything About Railway Sign

roof ventiletor in train
110 volt dc in train
side filling in train
lift here in coach
water tank in train
AC power of trai
screw coupler
CBC coupler
side buffer
work of side buffer
numbers on coach
general VS sleeper coach
differance between general and sleeper coach
pentry car in train
generator car in train
LV on train
coupling in train
battery in train