PR-43 was manufactured as a locomotive to pull the armored train BP-43 developed in 1942 to renew the PB-3 armored train. PR-43 was a 4-axis tender locomotive covered with up to 60mm armor. The tender is also equipped with a command post and anti-aircraft gun. BP-43 standard organization is one PR-43 locomotive, four PL-43 (T-34 turret equipped vehicles), four 37mm anti-aircraft armored freight cars, flat cars (for anti-ground mines and rail repair equipment) ) It consisted of 4 cars. In addition, there were several warning vehicles that changed the tires of BA armored vehicles to railroad wheels. 21 trains were produced from 1942 and played an active part in various places.