Are designed for delivery to the site of the work material, tool and work, for which they are fitted with a cargo platform. Firefighters designed to fire intelligence by rail, the elimination of small fires, fire places for railcars are equipped with fire brigade, pumping units, fire fighting equipment and some water tanks.
Railway cargo:

Passenger are designed for inspection and minor passenger transport, health - are equipped with spaces for stretchers and other necessary equipment for medical purposes. Initially Plant. Sverdlov in Gorky (1951-1952 years).
Railway passenger:

For the narrow-gauge railways 750mm.
Information in Russian / language:
http://uzd.spb.ru/auto.htm