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Prussian T 26
German Reichsbahn class 970
Germany | 1902 | 35 produced
No. 1982, built in Esslingen
No. 1982, built in Esslingen
Die Lokomotive, November 1905

The T 26 was a rack tank locomotive that was used in various regions of Prussia. It was intended for routes such as those found on the slopes of the Rhine or in the Thuringian Forest. The gradients of sometimes more than 6 percent could only be overcome with the help of a rack. The first three pieces came from the Esslingen machine factory, but the remaining 32 were built by Borsig on their own territory.

No. 9003, Borsig works number 6000
No. 9003, Borsig works number 6000
Locomotive Magazine, February 1907

The Abt rack system was used on these routes, which used two racks with offset teeth for better guidance and smooth running. Thus, the locomotives also had gears with two rows that were toothed alternately. This ensured that a tooth was engaged in the rack at all times.

Schematic drawing of the Borsig type with dimensions
Schematic drawing of the Borsig type with dimensions
Die Lokomotive, October 1907

In adhesion operation, the T 26 had three coupled axles and a trailing axle and could thus reach 45 km/h. When operating on the rack, two gear axles were used, the drive of which was separate from the coupled axles. The wheels were driven by two outer cylinders and the gears by two inner cylinders. Due to the reduced speed in rack operation to 15 or 20 km/h, the inner drive could be designed differently in order to achieve more traction.

Production of the T 26 ran until 1921 and two years later the locomotives were classified as class 970 when they were taken over by the Reichsbahn. During this time, however, the T 16.1 (class 945-17) and T 20 (class 95) were already being procured. Due to the cheaper operation of these two new locomotives, the last 970 were retired from the Reichsbahn in 1932. Seven pieces were sold to private and works railways and remained in service until the 1960s, but with the cogwheel drive removed.

VariantEsslingenBorsig
General
Built19021905-1921
ManufacturerEsslingenBorsig
Axle config0-6-2RT (Webb) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length34 ft 3 7/16 in
Wheelbase16 ft 6 13/16 in
Fixed wheelbase10 ft 7 15/16 in
Empty weight97,665 lbs107,475 lbs
Service weight123,238 lbs133,865 lbs
Adhesive weight92,153 lbs100,861 lbs
Axle load31,085 lbs33,620 lbs
Water capacity1,268 us gal
Fuel capacity2,646 lbs (coal)
Power
Power sourcesteam
Estimated power671 hp (500 kW)
Optimal speed9 mph
Top speed28 mph
Power Plant
Driver diameter42.5 in
Boiler pressure174 psi
Expansion typesimple
Cylindersfour, adhesion: 18 1/2 x 19 11/16 in
rack: 16 9/16 x 17 11/16 in
Boiler
Grate area22.7 sq ft
Firebox area101.2 sq ft100.8 sq ft
Tube heating area1,334.7 sq ft1,327.8 sq ft
Evaporative heating area1,435.9 sq ft1,428.6 sq ft
Total heating area1,435.9 sq ft1,428.6 sq ft
Calculated Values
steam locomotive
freight
passenger
secondary line
tank locomotive
cog railway
last changed: 01/2022
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