Our first coach had the 425 HP Cummins with 1,200 lb. ft. of torque weighing 40,039 lbs. The problem was not at start off but at passing on hills. I had no problem climbing the steepest hills, when I was not able to pass a very slow truck because of traffic, once my speed fell, it was hard to get it back to pass.
Our current coach has 1,750 lb. ft. of torque with 500 HP at 55,500 lbs. Even with the additional weight, I can pass a slow moving truck much better in this coach. As mentioned previously, torque is what moves the weight.
Safe travels,
MM.