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Seems to be the combination of a huge engine, with a very high-tech transmission that lets the diesel run as a diesel should; at a very low range of low rpms. The low-speed torque is because the engine itself is huge, and the tranny lets it step down suddenly when more torque is required. Done seamlessly, this ought to do it.

Wouldn't be surprised, however, to see a smart torque-return system incorporated into the tranny.