FRED

While it may seem on the surfaces, that getting stuff going from a dead stop requires greater low RPM torque, as it turns out, the differential ratios are about double in a gasser than they are in a diesel. That means the torque from the gas engine is also doubled as well. So either coach will have the same drive wheel torque from a dead stop. Technically, you don't care about measuring the torque at the engine, you want to measure the torque at the drive wheels. If you mathematically calculate the torque at the drive wheels, you will find that engines of similar HP will apply the same torque to the drive wheels, regardless of the rated engine torque.
The important thing to remember is that gear ratios multiply torque. IF you have 2 engines with the same torque rating, but one is running twice as fast as the other one, the one that is running twice as fast will have to be geared down for the same output RPM. As soon as you gear it down, the torque is doubled.