Yeah well it's all fine and dandy pullin' the chain at speed, 50-60 on the Limited, never really know any more but when you're only doing 15mph things are a little different eh!
And then one day you burst a hose entering a tunnel, train comes to a halt inside the black confines and you have to go back and get it changed, only thing is even though you can get off the loco at the rear you have to get down on all fours and crawl along under the overhanging wagons since even a skinny feller like me just couldn't slide past 'em.
Better keep that torch shining on those sleepers lest you find a landmine, eh boy!