During the Stolypin reform in Russia, which led to massive resettlement of peasants and prisoners in Siberia, a special type of carriage was introduced for these settlers. It consisted of two parts: a standard passenger compartment for a peasant and his family and a large zone for their livestock and agricultural tools.
After the Bolshevik Revolution, Cheka and NKVD found these carriages convenient for transport of larger numbers of incarcerated convicts and exiles: the passenger part was used for prison guards, whereas the cattle part was used for prisoners.
Prison transportation in modern Russia
Modern prison wagons are manufactured at Tver wagon plant, model 614500. The car has 9 chambers and is capable of transporting up to 75 convicts. Chambers have no windows, but there is a side corridor. It is escorted by 8 officers of the FPS and 2 Russian Railways conductors. The car is towed as part of regular passenger trains, but is clinged either to train head or tail and isolated from other cars.