Power for the tank was served through 1 x PZInz 425 4-stroke, 6-cylinder inline gasoline engine developing 95 horsepower. This supplied the hull with a top road speed of 34 miles per hour and an operational road range of 280 miles. Track wheels were suspended for cross-country travel.
The 4TP emerged in 1937 and was also known under the designation of "PZInz 140". Polish authorities were impressed enough with the indigenous design that they set an order for 480 examples to be manufactured. However, with the German invasion of Poland in September of 1939 to begin World War 2 (followed by the Soviet invasion a few weeks later), the 4TP initiative fell to naught.
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