The reference for locomotives and railcars
German Reichsbahn class 9810
originally Bavarian GtL 4/5
Germany | 1929 | 45 produced

In order to increase the top speed of the successful GtL 4/4 local locomotive, it was provided with a carrying axle. It was decided to attach this to the rear end of the locomotive and connect it to the last coupling axle using a Krauss-Helmholtz bogie. The boiler and cylinders remained unchanged compared to the GtL 4/4, but the supplies had been increased. The locomotives were unofficially called GtL 4/5, although according to the Reichsbahn scheme they became the class 9810.

In practice, the trailing axle was not entirely convincing, so the top speed could only be increased from 40 to 45 km/h. When production stopped, 45 had been produced. It was finally decided to equip the GtL 4/4 with a leading axle. The resulting class 9811 could be approved for 55 km/h.

Axle config0-8-2T
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length32 ft 11 11/16 in
Wheelbase19 ft 4 5/16 in
Service weight120,152 lbs
Adhesive weight101,853 lbs
Axle load25,794 lbs
Water capacity1,664 us gal
Fuel capacity6,614 lbs (coal)
Power sourcesteam
Indicated power444 hp (331 kW)
Optimal speed12 mph
Top speed28 mph
Starting effort24,495 lbf
Power Plant
Driver diameter39.6 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 18 1/8 x 20 in
Grate area14.6 sq ft
Firebox area63 sq ft
Tube heating area593.5 sq ft
Evaporative heating area656.5 sq ft
Superheater area203.8 sq ft
Total heating area860.3 sq ft
Calculated Values
steam locomotive
tank locomotive
secondary line
last changed: 09/2023

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