Bulgarian State 4-6-2 Locomotives in Bulgaria

Class Details by Steve Llanso of Sweat House Media

Class 07/05 (Locobase 1585)

Data from A.E.Durrant, The Steam Locomotives of Eastern Europe. (David and Charles: 1972), and from Wikipedia's "4-6-2 - Bulgaria" entry at [], last accessed 18 October 2020. Works numbers were 2459-2463 in 1941.

A quintet of passenger engines with relatively large grates to burn low-calorie coal. Bought from Krupp in 1941, they were intended to serve the recently upgraded service between Sofia, the capital, and Burgas at speeds up to 120 kph (74.5 mph). Originally designated Class 07, the engines took class ID 05 in 1942.

Somehow all five engines survived World War II and continued to operate into the mid-1970s. The lead locomotive was preserved and restored to operating condition in a project that ended in 2010.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID1585
RailroadBulgarian State
Number in Class5
Road Numbers07.01-05/05.01-05
Number Built5
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)116,928 / 53,038
Engine Weight (lbs / kg)225,344 / 102,214
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)65 / 32.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72.80 / 1849
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)18.5" x 27.6" / 470x701 (3)
Tractive Effort (lbs / kg)38,398 / 17417.06
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.05
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)51.65 / 4.80
Evaporative Heating Surface (sq ft / m2)2303 / 214.03
Superheating Surface (sq ft / m2)850 / 79
Combined Heating Surface (sq ft / m2)3153 / 293.03
Evaporative Heating Surface/Cylinder Volume178.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,988
Same as above plus superheater percentage15,225
Same as above but substitute firebox area for grate area
Power L1
Power MT

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