In the 1930s, aware of the disadvantages of hypotraction and wheeled tractors for mobile warfare, designs for artillery tractors began to emerge in the USSR on the chassis of tanks already in production. A tractor based on the T-19 (named Борец - Fighter) had not yet been realized, but in 1932 it left the drawing boards of the TR-26. The prototype, produced in the autumn of the same year , passed successful military tests (winter 1932-33) and was accepted into the DRRA armament. During the tests of the prototype (510 km in total), speeds of 29 km/h, 18.8 km/h, 15 km/h and 11 km/h were measured - solo and with trailers weighing 4, 5 and 7 tons.In 1934, the vehicle was renamed T-26T and the name TR-26 was applied to the prototype of the universal transporter-tractor.
Series production began in 1933 at the Im. K.Voroshilov and the tractors were produced in two versions - with armoured body T-26T and with canvas body T-26T2.
The vehicle had a hull identical to T-26-1931, and weighed 7,700 kg in the version with a canvas body with mica windows and 8,100 kg in the version with an armoured body with lockable metal windows on the sides and rear and two hatches on the roof. The superstructure could carry the gun crew and ammunition. The location of the crew, propulsion parts and power unit remained the same as on the T-26 tank. The vehicle was without organic armament. The plan for 1933 was to produce 200 units, only 163 vehicles were produced. The next year 34 units left the factory, and finally in 1936, 10 armoured and 4 "canvas" tractors were delivered to the DRRA, for a total of 211 tractors by 1939. They were mostly used to transport guns up to 76.2 mm calibre and howitzers up to 152 mm calibre.
Source
KOLOMIJEC, M: T-26-ťažolaja suďba ljogkogo tanka, Eksmo, Moscow 2007
KOLOMIJEC, M., SVIRIN, M.: T-26-mašiny na jego baze, Strategia KM, Moscow 1999