Good point. Fowler's 'Modern English Usage' suggests it didn't enter British English until the 1930s, so your original point stands. Sorry for introducing confusion.
I believe that first class passengers were entitled to a higher level of compensation in the event of injury. Placing them in the safest part of the train makes a kind of grim economic sense.
Random locomotive parts on display seems to be a Stokie thing. I came across a crank axle by the roadside in Tunstall. I think it was from a class 08 diesel shunter.