Window destination labels?

Question

Why, during the 1980's did British Rail stop putting the route labels on carriage doors and transfer them to the first window nearest the door?

Answer 1

Alan is correct!

Having gained plenty of them by the simple expedient of opening a door grabbing one and making off.

Who remembers the plastic destination cards that were in the toilet windows of HST's?

They took some getting out I can tell you!

Answer 2

to stop train spotters from pinching them in the stations