The reference for locomotives and railcars
Prussian G 1
Germany | 1878 | 93 produced

The engines later designated as class G 1 were light tender locomotives for freight service. They were ordered by the Prussian Ostbahn, as they had extensive branch lines on which the range of tank locomotives would not have been sufficient. These were locomotives with two coupled axles and no carrying axles, which were powered by a two-cylinder saturated engine.

The first production lot consisted of 44 examples and was delivered between 1878 and 1879. Later, under the administration of the state railways, a further need for these locomotives was identified. Therefore, a second series of 49 engines was purchased, which lasted from 1887 to 1898. The newer locos were a little lighter than the original ones, but could still produce the same power. This was achieved by increasing the boiler pressure from 10 to 12 bars and installing cylinders with a smaller diameter but slightly longer piston stroke.

From 1905 the locomotives were given the designation G 1 in order to be able to classify them into a specific type according to their purpose. Until then, the locomotives of the Ostbahn were only provided with numbers, the range of which gave little information about the type. The decommissioning then finally took place at the beginning of the twenties.

Variant1878 variant1887 variant
ManufacturerBMAG, Hanomag, Hohenzollern, Wöhlert, Schichau, Borsig, Henschel
Axle config0-4-0 (Four-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length43 ft 2 11/16 in43 ft 9 11/16 in
Length loco24 ft 8 7/16 in
Wheelbase9 ft 10 1/8 in
Fixed wheelbase9 ft 10 1/8 in
Empty weight54,763 lbs
Service weight60,704 lbs57,100 lbs
Adhesive weight60,638 lbs57,100 lbs
Axle load30,821 lbs28,550 lbs
Water capacity2,113 us gal
Fuel capacity5,512 lbs (coal)
Power sourcesteam
Estimated power402 hp (300 kW)
Optimal speed17 mph
Top speed28 mph
Starting effort15,226 lbf15,044 lbf
Power Plant
Driver diameter53.2 in
Boiler pressure145 psi174 psi
Expansion typesimple
Cylinderstwo, 16 9/16 x 24 intwo, 14 3/4 x 24 13/16 in
Grate area15.8 sq ft15.6 sq ft
Firebox area61.2 sq ft
Tube heating area958 sq ft998.9 sq ft
Evaporative heating area1,019.2 sq ft
Total heating area1,019.2 sq ft
Calculated Values
steam locomotive
last changed: 01/2022

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