C7P C7P ( an abbreviation of Ciągnik Siedmiotonowy Polski , " 7 - tonnes Polish Tractor " ) was a Polish tracked artillery tractor , used by the Polish Army before and during World War II . The tractor was developed by the design bureau of Witold Jakusz of the PZInż company between 1931 and 1934 . In 1931 Poland bought several dozens of British Vickers E tanks and a license to build additional tanks at home . The Polish Army also considered purchase of the then - constructed Dragon Medium Mk IV artillery tractor , based on the Vickers E , but the purchase never happened . As the British tank was considered not suited for service in Polish climate and needed adaptation , it was decided that a similar Polish tank be built as a modification of the Vickers ' design . The tank , initially code - named VAU - 33 , with time became the 7TP . Simultaneously , works started on a new artillery tractor for the Polish Army that was to replace the Citroën - Kegresse tractors built in France in early 1920s . The main advantage of the new model of artillery tractor , dubbed " C6P " , " C6T " and finally " C7TP " was to be its low price , ease of manufacture and durability . For that purpose , the C7P shared many parts with the 7TP light tank , produced simultaneously . In fact the chassis was almost a direct copy of the tank , while the superstructure was partially borrowed from a license - built Saurer bus . In 1933 the first two prototypes were constructed in the Ursus factory of the PZInż . The " C6P " had the engine placed in the front and used front wheel drive , while the " C6T " had the engine placed behind the crew compartment and used the rear wheel drive . After a series of tests the C6P was chosen as a better option . In fact the new tractor , later redesignated as C7P , was much superior to its contemporary counterparts , particularly the British Dragon Medium Mk IV and the Soviet T - 26T , both in terms of power and additional equipment . The final project included a closed crew compartment and a motor - driven winch . In 1934 the production started . Out of approximately 350 ordered , only 151 were built until the outbreak of World War II . Approximately 108 were sold to the artillery units , where the C7P was used as an artillery tractor in the regiments of heaviest artillery , mainly for towing of heavy 220 mm wz . 32 Škoda mortars . Additional 18 tractors were attached to various tank units , mostly the Polish 10th Motorized Cavalry Brigade for towing of immobilized tanks and for transport of tanks to the battlefield on specially designed towing platforms . Finally , two tractors were delivered to the engineering units for road maintenance and destruction of railways in case of a war . Until 1942 additional 52 were to be delivered to various communal services , where they were to be used as snowplow s to keep the roads in good condition in case of a war . During the Polish Defensive War of 1939 all C7P were used in active service . Most were captured by the Germans and were used as towing machines and snowplows at least until 1941 . No example of the C7P survives today . However , a single C7P hull was recovered near Volgograd few years ago . This hull was restored with a BT - 5 or BT - 7 turret and now looks like a T - 26 tank . It is now on display at the Victory Park , Poklonnaya Gora in Moscow