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Saxon VII T (Hartmann type)
German Reichsbahn class 9870
Germany | 1882 | 43 produced
No. 1459 “Gustav Zeuner” on a Hartmann company photo
No. 1459 “Gustav Zeuner” on a Hartmann company photo

The Saxon class VII T included various two-axle local railway tank locomotives, most of which still came from the private railways. Later, the state railway procured another 42 locomotives that were similar to the existing ones. Like other local railroad locomotives, they were of simple design, since cheap maintenance was more important than high speeds or high tractive effort. Because the production batches were a total of twelve years apart, there were some changes from batch to batch. For example, the first engines only took the live steam from a regulator on top of the boiler, but the later ones had a large steam dome. The braking effect was only on the wheels of the locomotive, an air brake was not yet available.

There was also a one-off that had a longer wheelbase, larger wheels, was lighter and was 5 km/h faster. However, it was not built in series and retired in 1927. The Reichsbahn took over 29 of the 42 production machines in 1925 as numbers 98 7051 to 98 7079. After the Second World War, all remaining examples came to the Reichsbahn of the GDR and the last ones were used there until 1967. One of them still exists today in its original color scheme.

Variantlight variantheavy variant
General
Built1882-1894
ManufacturerHartmann
Axle config0-4-0T (Four-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length25 ft 10 3/16 in
Empty weight41,888 lbs45,636 lbs
Service weight54,234 lbs58,863 lbs
Adhesive weight54,234 lbs58,863 lbs
Axle load27,117 lbs29,542 lbs
Water capacity766 us gal
Fuel capacity1,984 lbs (coal)
Power
Power sourcesteam
Estimated power174 hp (130 kW)
Optimal speed8 mph
Top speed25 mph
Starting effort13,919 lbf
Power Plant
Driver diameter43.3 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 14 x 20 7/8 in
Boiler
Grate area9.7 sq ft
Firebox area48.4 sq ft
Tube heating area419.8 sq ft
Evaporative heating area468.2 sq ft
Total heating area468.2 sq ft
Calculated Values
steam locomotive
freight
passenger
tank locomotive
local railway
last changed: 01/2022
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