alright trackfitter, think about it- the upstop wheels on coaster trains are universally smaller than the running wheels above the track, if the drop was 90*, the top wheels would be constantly losing contact with the track, forcing the upstops against the track. By keeping the drop shy of vertical, the top running wheels stay in contact with the track all the time, making the ride smoother, and keeping down the rpm's on the upstops. plus, look at the pic -
http://www.twistedrails.com/sfmm2k1/jun27-09.shtml - if the support is truly vertical, then the horizontal supports should all be equal, but they vary in size
*** This post was edited by sfmm_x_dude on 7/10/2001. ***