09-21-2011, 12:40 PM
Andrew I'm guessing because of the very tight curves we have here in the mountains. Being is it was a branchline and never intended to be a mainline I'm guessing the curves were tighter than normal. Topton is on a compensated grade of around 7%. Trying to get 3 SD's thru that double curve (S curve) while on that kind of grade may not be doable. But 3 GP's go up it with no problem.
Mike
Sent from my pocket calculator using two tin cans and a string
Sent from my pocket calculator using two tin cans and a string