Alright, I'm designing an underground train that steals the souls of surface dwellers that hear its Shadow Song for my world of Nytheun. As such, I turned to Armored Assualt for its vehicle construction rules. The locomotive is based on the 4-8-4 Northern Locomotives that first came into production in the late 1920's. So I'm modifying the AA Vehicle Construction rules a little to fit early 20th century tech. But in so doing, I've got a pretty basic question that doesn't even touch on modifying the construction rules. Simply put: how do you calculate a vehicle's hits? I was under the impression that hits = mass. But looking at the example vehicles in AA; SS & their vehicle compendiums this doesn't seem to be the case. So how does one calculate construction HPs?
Nightblade ->--
p.s. The idea for the "Demonic Underground Train" came from the amazing King Crimson song Doctor Diamond.