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Prussian S 7
Germany | 1902 | 238 produced
De Glehn type, 1903 variant with elongated firebox
De Glehn type, 1903 variant with elongated firebox
Die Lokomotive, November 1910
De Glehn type, 1905 variant with a wide firebox
De Glehn type, 1905 variant with a wide firebox
Die Lokomotive, November 1910
Von Borries type with Lentz valve gear
Von Borries type with Lentz valve gear
Die Lokomotive, November 1910
Sectional drawing of the De Glehn type with an elongated firebox
Sectional drawing of the De Glehn type with an elongated firebox
Die Lokomotive, November 1910
Sectional drawing of the De Glehn type with a wide firebox
Sectional drawing of the De Glehn type with a wide firebox
Die Lokomotive, November 1910

The class S 7 designates slightly different types of express train locomotives of the “Atlantic” type with four-cylinder compound engines. These either had the UIC wheel arrangement 2'B1 with a fixed trailing axle or 2'B1', where the trailing axle was designed as a Bissel axle

A variant was developed by Grafenstaden in Alsace and 79 examples were built between 1903 and 1905. Henschel was also involved in the production. What they had in common was the de Glehn design, in which the high and low pressure cylinders each drove an axle and could be controlled separately. These locomotives were in turn divided into two types. On the one hand, the short and wide firebox was completely behind the coupled wheel sets and the leading bogie had an inner frame. On the other, the firebox was long and narrow, allowing it to fit between the wheels. Here the bogie had an outer frame. One thing they had in common was that both versions had a fixed trailing axle

The other variant was developed by Hanomag and built 159 times between 1902 and 1907 by this company and by Linke-Hofmann-Busch. In contrast to the Grafenstaden locomotives, these were designed according to the Von Borries design. This means that all four cylinders were fitted on the same length and only worked on the first coupled axle. In addition, the trailing axle was movably mounted on these.

Although these locomotives were only certified for speeds of 100 or 110 km/h, speed records of up to 143 km/h were achieved. It was even possible to exceed the speed of the streamlined S 9 test locomotive with which it was compared. A disadvantage in operation soon became apparent that the adhesive weight of 30 tonnes was no longer sufficient for the increasing loads in express traffic. For this reason, the area of operation of the S 7 shifted towards normal passenger trains after the First World War. In the early 1920s, all locomotives were taken out of service, so that the Reichsbahn no longer included them in their renumbering plan.

VariantDe Glehn 1903De Glehn 1904De Glehn 1905Von Borries
General
Built1903190419051902-1907
ManufacturerGrafenstadenHanomag, Linke-Hofmann
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length60 ft 4 5/8 in
Length loco37 ft 0 7/8 in
Wheelbase26 ft 10 13/16 in29 ft 6 5/16 in29 ft 0 7/16 in
Fixed wheelbase6 ft 10 11/16 in7 ft 0 1/4 in6 ft 10 11/16 in
Empty weight125,663 lbs126,766 lbs119,138 lbs
Service weight143,300 lbs138,671 lbs141,030 lbs132,718 lbs
Adhesive weight70,548 lbs69,446 lbs70,107 lbs67,020 lbs
Axle load35,274 lbs34,723 lbs35,053 lbs33,510 lbs
Water capacity5,680 us gal
Fuel capacity15,432 lbs (coal)
Power
Power sourcesteam
Estimated power1,006 hp (750 kW)1,073 hp (800 kW)
Optimal speed44 mph47 mph46 mph
Top speed68 mph
Starting effort14,611 lbf14,871 lbf
with start valve17,533 lbf17,845 lbf
Power Plant
Driver diameter78 in
Boiler pressure203 psi
Expansion typecompound
Cylindersfour, HP: 13 3/8 x 25 3/16 in
and LP: 22 1/16 x 25 3/16 in
four, HP: 14 3/16 x 23 5/8 in
and LP: 22 1/16 x 23 5/8 in
Boiler
Grate area29.3 sq ft28.7 sq ft32.4 sq ft29.2 sq ft
Firebox area161.5 sq ft105.5 sq ft113.9 sq ft107.9 sq ft
Tube heating area1,517.7 sq ft1,798.9 sq ft1,753.7 sq ft
Evaporative heating area1,679.2 sq ft1,904.3 sq ft1,912.7 sq ft1,861.5 sq ft
Total heating area1,679.2 sq ft1,904.3 sq ft1,912.7 sq ft1,861.5 sq ft
Calculated Values
steam locomotive
express
De Glehn compound
Von Borries compound
last changed: 01/2022
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