Something I found very interesting with the release of Update... was it 4 that brought T2 trains? I don't know, but it's the T2 steam train.
On the T1, the engine is on the body, driving a crankshaft on the bottom of the locomotive, which probably driveshafts its way to the trucks to actually drive the locomotive. That arrangement makes sense to me, as it turns the locomotive into, essential…

