The narrow-gauge railway of KSM-2 factory is located in Tver, Russia.

The railway was opened in 1951, and has a total length of 9 kilometres (5.6 mi), its track gauge is 750 mm (2 ft 5+1⁄2 in).

The first section of the 3 kilometres (1.9 mi) long railway was built in 1951.

[1] The main task of the narrow-gauge railway is the transportation of sand from the quarry to the KSM-2 factory.

It runs on a daily basis, the speed of the train is 35–40 km/h (22–25 mph), the total length of the railway is 9 kilometres (5.6 mi).