The reference for locomotives and railcars


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German Federal Railway class 5040
Rebuilt from... class 50
Germany | 1954 | 31 produced
50 4023 in August 1961 in Spich
50 4023 in August 1961 in Spich
Ben Brooksbank

After initial attempts with the Franco-Crosti boiler on the class 42 were unsuccessful due to corrosion damage, a new attempt was made in 1954 on a class 50 locomotive. Since this enabled a coal saving of 22 percent to be achieved, 30 other locomotives were converted in exactly the same way in 1958 and 1959. One problem was the smoke from the central chimney, which was improved with a wind deflector. As early as 1961, corrosion damage to the boiler was also found on these locomotives. Since the conversion measures now required were more expensive than the savings in coal, the locomotives were retired by 1967.

Built1954, 1958-1959
ManufacturerHenschel, AW Schwerte
Axle config2-10-0 (Decapod) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length75 ft 3 1/8 in
Wheelbase30 ft 2 3/16 in
Fixed wheelbase10 ft 9 15/16 in
Service weight199,739 lbs
Adhesive weight172,842 lbs
Total weight334,220 lbs
Axle load34,613 lbs
Water capacity6,868 us gal
Fuel capacity17,637 lbs (coal)
Power sourcesteam
Indicated power1,519 hp (1,133 kW)
Optimal speed19 mph
Top speed50 mph
Starting effort51,897 lbf
Power Plant
Driver diameter55.1 in
Boiler pressure232 psi
Expansion typesimple
Cylinderstwo, 23 5/8 x 26 in
Grate area32.8 sq ft
Firebox area186.2 sq ft
Tube heating area1,896.3 sq ft
Evaporative heating area2,082.5 sq ft
Superheater area525.3 sq ft
Total heating area2,607.8 sq ft
Calculated Values
steam locomotive
Franco-Crosti boiler
last changed: 03/2023

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