Belgian State Railways 2-4-2 Locomotives in Belgium

Class Details by Steve Llanso of Sweat House Media

Class Series 12bis (Locobase 10088)

Data from "Recent Belgian Locomotives," The Locomotive & Railway Carriage & Wagon Review, Vol III (May 1898), p. 70.

The author explains that this is a successor class to the Type 12s (Locobase 2568) that ran over most of the lines at the time. Road numbers included 911-912, 922, 943, 949, 1454, 2092-2100, 2220-2229. Among the changes were the adoption of Serve boiler tubes, a higher boiler pressure, and a conical stack with lip. The heavy outside frame remained.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassSeries 12bis
Locobase ID10088
RailroadBelgian State Railways
Number in Class26
Road Numbers911+
Number Built26
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.58 / 1.70
Engine Wheelbase (ft / m)10.99 / 3.35
Ratio of driving wheelbase to overall engine wheelbase 0.51
Overall Wheelbase (engine & tender) (ft / m)10.99 / 3.35
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)111,995 / 50,800
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)359 / 1.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)82.70 / 2100
Boiler Pressure (psi / kPa)175.50 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)19.69" x 23.62" / 500x600
Tractive Effort (lbs / kg)16,518 / 7492.45
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm) - 2.756" / 70
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)126.97 / 11.80
Grate Area (sq ft / m2)50.57 / 4.70
Evaporative Heating Surface (sq ft / m2)1377 / 128
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1377 / 128
Evaporative Heating Surface/Cylinder Volume165.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8875
Same as above plus superheater percentage8875
Same as above but substitute firebox area for grate area22,283
Power L15846
Power MT

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