Tim Brien said:Dan,
the 'shorty' US passenger coach is a basic four wheel LGB body with clerestory roof and bogie/truck underframe. Apart from a slight height increase from the clerestory roofline the other dimensions (width/length) would be the same as the generic starter set coach.
steve parberry said:Just needs to be that wide so you could get more baggage in it (aka batteries), also shorter vehicles can sometimes be wider in real life as you get less centre through on corners.