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 , its track gauge is . It is used for the transportation of sand from the "Red Quarry" to the KSM-2 factory.
The Tver plant of building materials No.2 located near the town of Tver. The first section of the long railway was built in 1951. 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 , the total length of the railway is .