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Prussian T 7
German Reichsbahn class 8964 and 8978
Germany | 1881 | 408 produced
Variant by Hohenzollern
Variant by Hohenzollern
Die Lokomotive, June 1924

The T 7 was developed in order to have a small tank locomotive for heavy shunting services and for use in front of freight trains on short branch lines, which is slightly more powerful than the T 3. From 1881, over 400 engines were built over a period of 22 years, of which more than every tenth was delivered to a private railway and the rest to the Prussian State Railways.

“Ruhr variant”, built by Hanomag
“Ruhr variant”, built by Hanomag
Die Lokomotive, September 1921

In principle, these had the same design as the T 3, i.e. three coupled axles, no carrying axles, a simple construction in general and a two-cylinder saturated engine with external Allan controls. Overall, however, the T 7 was larger, with a service weight increased by more than ten tonnes, larger cylinders and a larger wheel diameter. The supplies have also been expanded in line with the higher output.

The former TKh2-12 of the PKP is now in the original KPEV livery as “Breslau 1836” in the museum in Jaworzyna Slaska
The former TKh2-12 of the PKP is now in the original KPEV livery as “Breslau 1836” in the museum in Jaworzyna Slaska
Hugh Llewelyn

The procurements of the state railways were completed in 1893, when 371 locomotives had been delivered. The number of examples that went to various private railways by 1903 was between 37 and 65, depending on the source. The private operators included small, industrial and port railways.

Of the 137 locomotives included in the 1923 renumbering plan, 68 were actually taken over, which were given the numbers 89 7801 to 89 7869 by the Reichsbahn. Almost all of these engines were retired or resold in the 1930s. The last example used was the SEG 372 used by the Süddeutsche Eisenbahn-Gesellschaft between Arnstadt and Ichtershausen in Thuringia, which had been taken over by the Reichsbahn of the GDR in 1949. It remained in service as 89 6401 until 1967.

VariantRuhr variantHanomag
General
Built1881-1903
ManufacturerBorsig, Hanomag, Hohenzollern, Union Königsberg
Axle config0-6-0T (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length31 ft 4 3/8 in31 ft 4 3/4 in
Wheelbase12 ft 1 11/16 in
Fixed wheelbase12 ft 1 11/16 in
Empty weight68,343 lbs75,618 lbs
Service weight92,418 lbs98,547 lbs
Adhesive weight92,418 lbs98,547 lbs
Axle load32,849 lbs
Water capacity1,321 us gal1,453 us gal
Fuel capacity3,307 lbs (coal)
Power
Power sourcesteam
Estimated power335 hp (250 kW)
Optimal speed13 mph11 mph
Top speed28 mph
Starting effort16,484 lbf19,928 lbf
Power Plant
Driver diameter53.2 in52.8 in
Boiler pressure145 psi174 psi
Expansion typesimple
Cylinderstwo, 16 15/16 x 24 13/16 in
Boiler
Grate area14.2 sq ft15.1 sq ft
Firebox area65.9 sq ft63.5 sq ft
Tube heating area969.4 sq ft885.9 sq ft
Evaporative heating area1,035.3 sq ft949.4 sq ft
Total heating area1,035.3 sq ft949.4 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
last changed: 01/2022
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