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Bulgarian State Railway series 600.76
Bulgaria | 1940 | 15 produced
615.76 on display at the Sofia University campus
615.76 on display at the Sofia University campus
Roman Klementschitz

For the narrow gauge railway in the Rhodopes with gradients of three percent and curve radii of 60 meters, the Bulgarian State Railways needed powerful freight locomotives. These were based on the Reichsbahn's class 9973-76 and had slightly larger wheels to reach a speed of 45 km/h. The first five were delivered by BMAG in Berlin, another ten were built in Poland by Fablok due to the Second World War.

They fully met the requirements and were replaced by diesel locomotives of the class 75 in the 1960s. They were now used on other lines with lower gradients, where severe signs of wear showed up due to continuous operation at top speed. After eight locomotives were retired in 1977, the remaining ones were stored as a strategic reserve. Today four still exist, one of which is still operational.

General
Built1940, 1949
ManufacturerBMAG, Fablok
Axle config2-10-2T (Santa Fé) 
Gauge2 ft 5 15/16 in (Bosnian gauge)
Dimensions and Weights
Length36 ft 11 5/16 in
Wheelbase26 ft 2 15/16 in
Fixed wheelbase13 ft 9 3/8 in
Empty weight103,176 lbs
Service weight136,686 lbs
Adhesive weight110,231 lbs
Axle load22,046 lbs
Water capacity1,849 us gal
Fuel capacity8,818 lbs (coal)
Power
Power sourcesteam
Indicated power838 hp (625 kW)
Optimal speed18 mph
Top speed28 mph
Starting effort30,448 lbf
Power Plant
Driver diameter33.5 in
Boiler pressure232 psi
Expansion typesimple
Cylinderstwo, 18 1/8 x 15 3/4 in
Boiler
Grate area21.5 sq ft
Evaporative heating area942.9 sq ft
Superheater area350.9 sq ft
Total heating area1,293.8 sq ft
Calculated Values
steam locomotive
freight
passenger
tank locomotive
narrow gauge
last changed: 09/2023
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