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.