In message , Cast_Iron
writes
"People like people", i.e. passengers like to know there is someone on
hand to deal with a situation as it arises.

But the whole point is. Have the train driver checking tickets and
making a presence felt on the train. If the train breaks down or any
technical problem. They can sort out the problem quickly. As they are
already on the train.
Maybe the drivers wouldn't like the idea of leaving the cab and having
to deal with the customers....
--
CJG