The Holt gas–electric tank was the first prototype tank built in the United States[1] in a collaboration between the Holt Manufacturing Company (now Caterpillar Inc.) and the General Electric Company.

The tank was based on a lengthened and modified version of the suspension of the Holt Model 75, with pivoting track frames.

[3] The vehicle had a Holt 90 horsepower (67 kW), 4-cylinder engine fitted with a General Electric generator driving an electric motor for each track; a comparable petro-electric system had earlier been used for the French Saint-Chamond that also was fitted with a lengthened Holt suspension.

To prevent overheating the transmission—a constant problem with electrical types—a complicated water cooling system had been installed.

Only one was built as tests showed its climbing performance was unsatisfactory, and it was much heavier than planned, about 25 short tons (23 t).