ČSD Series 850 851
Motorové vozy 850 (M 286.0) “Hydra” at the Bratislava Transport Museum (Bratislava, Slovakia)
The 850 and 851 series diesel railcars were built in the 1960s at Vagónka Tatra Studénka (now Škoda Vagonka). Czechoslovak State Railways (ČSD) used them, first as the M 286.0 (later Class 850) and M 286.1 (later Class 851), to haul express and local trains, not only on the main non-electrified lines. In Slovakia they were retired by 2007, while Czech Railways (ČD) ran them until 2014.
Overview
These were large four-axle railcars with a self-supporting body of welded steel profiles, mounted on two bogies, one of which was powered. The Class 850 had a ČKD K 12 V 170 DR diesel engine producing 515 kW, while the Class 851 had an upgraded ČKD KS 12 V 170 DR engine producing 588 kW. Besides the new engine, the 851 differed from the 850 in its NK15 and NK18 axle gearboxes and its 3 DSK 75 compressor. Its appearance was also slightly changed by removing the small window in the luggage compartment.
The engines used in the 851 proved unreliable. In the early 1980s their output was permanently cut from 588 kW to 515 kW.
The interior was divided into a driver’s cab at the front, an engine room, a luggage area, an entrance area with a toilet, a large open passenger compartment, a second entrance area, and a rear driver’s cab. Both cabs had through passages, so the cars could be coupled to trailers.
Characteristics
Manufacturer: Vagónka Tatra Studénka (now Škoda Vagonka)
Years of production: 1962—1968
Production: 89 units
Length: 24,790 mm
Track gauge: 1435 mm
Passenger capacity: 108 (48 seats)
Power: 515–588 kW
Max. speed: 110 km/h
Weight: 50 t
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