Why not diesel electric trucks?

Electric motors, especially DC motors, can have over 300% torque at ZERO RPM

No ICE's can do that and getting it going from a dead stop requires that. As all ICE's have no torque at zero RPM

Age old discussion and bring this up as an example:

All ICE's use an electric motor to start it because an ICE can NOT develop torque until it gets RPM

well, there is a reason locomotive use electric traction motors, likely for the level of control and ease of drivetrain accomidation, A pure diesel electric likely wouldn't be as efficient as diesel and conventional drivetrain. And that the electric motors they use develop max torque at 0 rpm and pretty constant torque at very very low rpm, ideal for getting a locomotive moving. And that they can control each drive wheel independently. And with mulitple locomotives in series they don't need to sync the ICE engines, just the electric motors which are orders of magnitude easier to sync.

But why not diesel hybrids? that's what i wonder about. if a diesel 3/4 -1 ton truck had a hybrid system good enough to even capture energy from a in town stop 45mph or so and use it for drive augmentation I suspect it would pick up considerable in town mileage. And add enough battery to capture a a mile or so of downhill when towing, wow, I'd go for that even if it reduced payload moderately.

As far as diesel start/stop I suspect it isn't used much because a diesel is so fuel efficient at idle compared to a gas engine it doesn't buy much.