Peat was used as a fuel for generating electricity on a considerable scale in the USSR, as in several other European countries. One of the principal sources was in the Tesovo area, some 120 km south-east of St Petersburg and 600 km north-west of Moscow. The scale of the workings can be judged by the extent of the 750 mm gauge railway system which once extended to 170 km. Passenger trains were operated on some parts of the network, and it had a sophisticated semaphore signalling system. Peat was supplied to power stations that provided electric power for St Petersburg (then Leningrad), but in the 1990s other means of generating power were adopted, and the workings declined. A group of enthusiasts undertook to conserve some 20 km of the network as a traditional peat railway. Visitors can see several diesel locomotives in operation, and ride on some of the trolleys once used by peat workers. This may well be the only peat railway in Europe to operate a dining car. The railway featured in an attempt by the Red Arm in the spring of 1942 to break the siege of Leningrad, an event that was commemorated in a re-enactment in 2014.