That is incorrect. Toyota's Hybrid Synergy Drive is able to power the wheels with either 100% electric, or 100% gas, or a combination of the two using planetary gears. This allows the use of a more efficient engine running the Atkinson cycle, with the electric motors filling in for the reduced low-end torque.

At highway speeds the engine is driving the wheels directly, which is more efficient than converting torque to electric power to drive an electric motor. Honda's two-motor system runs much like the transmission you linked, but again drives the wheels directly at highway speeds.

I must have misunderstood the GP then, sorry :(

The Toyota system seems fairly different than a diesel-electric train system to me. As I understand it in a diesel electric system the three components (diesel engine, generator and electric motor) all do one thing the whole time and there's no batteries. In the Toyota system however the electric motors can flexibly act as either motors or generators. The gas engine in Toyota also doesn't need to always be on to provide power.

Toyota's hybrid system differs from trains in that there's a direct mechanical connection from the engine to the wheels, boosting efficiency by not requiring all of the power to go through the motors.