After reading all the problems with the SPH pack I did some research and then applied it to the locos.According to the locomotive equipment book that I obtained while going thru the conductors course back in the 90's all the locos had a wheel diameter of 40 inches.Most of the wheel diameters that I see in the engine files are 20 inches.Way too small for a loco I feel.I applied this diameter to all the SPH2 locos and all the places where trains were stalling I didn't have a problem at all.Before the change I too experience stalled on grades that were relatively slight.I know that it's a hassle but you may want to consisder changing the wheel diameter to get better traction with the rail.The SD70 and dash 9 had a wheel diameter of 42 inches.This info was obtained from the NS Locomotive Equipment Book from the Locomotive Department Roanoke Va.Claude Debnam NS Piedmont Division Raleigh East
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