a terminal case of the old
"NOT INVENTED HERE" syndrome.
But with the hybrid -- GM had all the pieces while Toyota was still screwing around with the old Toyopet
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They had the diesel-electric locomotive from their Lectromotive Division, they had the diesel electric plants for the Navy DDE Destroyer Escorts and the Coast Guard WHEC high endurance cutters from their Detroit Diesel subsidiary, they had the diesel electric off road vehicles from their LeTourneau subsidiary
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Most interesting, as a back fill when their Willow Run Hydramatic plant was totaled in a fire in 1952, they actually prototypes an "Electrodynamic Transmission" - gasoline engine ran a generator, the generator drove the wheels, shifting was by rheostats. (This was a popular engineering exercise to keep auto company engineers busy and out of trouble - everybody had one flavor or another of this kind of auto transmission in their engineering center in the late 1940's and early 1950's).
And during WW2, Divco paired with GM's Detroit Diesel to retrofit some Divco trucks
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with a generator and electric motor. Very few were made (custom, onesie-twosie retrofits). Ran an electric motor off of a battery, the on-board diesel recharged the battery when it got low (the was during the WW2 era of gasoline rationing). (This kluge was also described in a DU append back around February - but I could't find it).
My bottom line, take home at the end of the day -- GM had all of the pieces and never put them together.