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Prussian G 42
German Reichsbahn class 530-2
Germany | 1882 | 780 produced
Die Lokomotive, April 1910

After gaining experience with double steam expansion in Prussia with the two omnibus locomotives from 1880 onwards, the G 41 was developed into the first series-produced engine with a compound engine. The resulting G 42 was a complete success and not only achieved much higher sales figures than its prototype, but could also be sold to other railways.

A typical problem for compound steam locomotives was the starting behavior, because the high and low pressure cylinders could only be flown through in one order with normal piping. Under these circumstances, a special starting device had to be developed with which the locomotives could start moving even if the wheels were in an unfavorable position. After solving this problem, the G 42 proved to be very economical, making it particularly suitable for longer journeys with heavier freight trains and was mass-produced in large numbers. Since conventional simple locomotives were better able to hold their own on routes with multiple stops, the G 41 continued to be produced in smaller numbers.

780 examples were completed for the Prussian State Railways, which were later supplemented by more after acquisitions of private railways. These included the East Prussian Southern Railway, the Werra Railway and the Royal Prussian Military Railway. Larger numbers were also built by the Grand Duchy of Oldenburg State Railways and the Imperial Railways in Alsace-Lorraine, with numbers of 27 and 57 respectively. Other customers with smaller numbers were the Lübeck-Büchener Eisenbahn and the Mecklenburg Friedrich-Franz-Eisenbahn.

Sectional drawing with dimensions
Sectional drawing with dimensions
Die Lokomotive, August 1924

As with its sister model, an extraordinarily small number of only six had to be handed in as reparations after the World War, but their number was reduced very quickly in the following years. 295 were to be taken over by the Reichsbahn as numbers 53 001 to 53 295, but in 1925 only 24 were left. The last ones were decommissioned in 1930, if one disregards a few incorporations of railways that were taken over later.

General
Built1882-1903
ManufacturerHenschel, BMAG
Axle config0-6-0 (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length50 ft 4 13/16 in
Wheelbase11 ft 1 7/8 in
Fixed wheelbase11 ft 1 7/8 in
Total wheelbase34 ft 8 1/8 in
Empty weight78,815 lbs
Service weight90,720 lbs
Adhesive weight90,720 lbs
Total weight165,236 lbs
Axle load30,247 lbs
Water capacity2,774 us gal
Fuel capacity8,818 lbs (coal)
Power
Power sourcesteam
Estimated power469 hp (350 kW)
Optimal speed20 mph
Top speed34 mph
Starting effort15,196 lbf
with start valve18,235 lbf
Power Plant
Driver diameter52.8 in
Boiler pressure174 psi
Expansion typecompound
Cylinderstwo, HP: 18 1/8 x 24 13/16 in
and LP: 25 9/16 x 24 13/16 in
Boiler
Grate area16.5 sq ft
Firebox area84 sq ft
Tube heating area1,164.7 sq ft
Evaporative heating area1,248.6 sq ft
Total heating area1,248.6 sq ft
Calculated Values
steam locomotive
freight
last changed: 01/2022
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