I, although like drawing trains, can never get the patience to draw one very precisely. This is probably the best one I have (on an A4):
An old German locomotive EL2 that once hauled limestone from the quarry to the cement factory of Brocēni in Latvia. The railway was closed in late nineties with the limestone now being carried by trucks.
This drawing is now on the wall of the passenger waiting room of Brocēni station. Sadly, the only passenger train doesn't stop there anymore.