Did you ever wonder why the last coach of train is marked with X letter

The yellow X sign denotes the coach is the Last Vehicle of the train

The X sign is always present on the last coach

The mark helps railway staff at a station know the whole rake has passed

During night or foggy weather, railway staff looks at blinking red lamp on the back of coach

Fun fact: X is a cross mark not an English letter

X always represents that something ends there, hence X on train’s coach

Absence of X means, the train has emergency or missing its coaches

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