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Belgian Railway type 12bis
Belgium | 1897 | 26 produced
Die Lokomotive, December 1917

In order to be able to burn cheap coal with the smallest fragments, the Belgian State Railways needed a large firebox for their express locomotives. This also applied to the type 12bis, which was based on the type 12 from 1888 and where the “bis” stood for “second”. In order to achieve the required power, the grate area had to be further increased to 4.7 square meters or 50 square feet

On the 12bis, too, the firebox consisted of a narrow, front part between the wheels of the second driving axle and a wide, rear part above the trailing axle. It still had outside frames, as well as serve tubes and a conical chimney. It was said to run smoothly even at 110 km/h (68 mph)

General
Built1897
ManufacturerCockerill
Axle config2-4-2 (Columbia) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco35 ft 4 3/16 in
Wheelbase21 ft 6 7/16 in
Fixed wheelbase21 ft 6 7/16 in
Empty weight101,413 lbs
Service weight108,467 lbs
Adhesive weight58,092 lbs
Total weight184,968 lbs
Axle load29,652 lbs
Water capacity3,698 us gal
Fuel capacity6,614 lbs (coal)
Power
Power sourcesteam
Estimated power738 hp (550 kW)
Optimal speed29 mph
Starting effort16,375 lbf
Power Plant
Driver diameter82.7 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 19 11/16 x 23 5/8 in
Boiler
Grate area50.7 sq ft
Firebox area134.5 sq ft
Tube heating area1,207.4 sq ft
Evaporative heating area1,342 sq ft
Total heating area1,342 sq ft
Calculated Values
steam locomotive
express
Alfred Belpaire
last changed: 01/2024
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