Re: tractive effort equation

Tractive effort is steam pushing on the piston, it doesn't matter is it is superheated or saturated steam. The truth of the matter when an locomotive with a steam some throttle starts a train from a long rest, the superheater isn't hot enough to do anything anyway.
Tractive Effort is what the locomotive will start. It has nothing to do with speed or whether the boiler can maintain the steam pressure to keep the train moving.
I think I have seen tonnage ratings for the DRGW standard gauge with different ratings for both superheated and saturated power of the same class. In this case the tonnage was adjusted to where the "soak" could get over the road in reasonable fashion. In theory, both locomotives could pull the higher tonnage.