Question

Why are the mark 'X' on the backside of train.

Answer 1

the mark x on the back side of the train because the mark x is red in colour ,the red has higher wave length,to identify their is train box after that x mark.

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Answer 2

Answer:

It is used to indicate that it is the last coach of the train and it is painted red which has more wavelength and can easily be seen in the white mist.