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The reference for locomotives and railcars

Saxon VII (Schwartzkopff type)

Germany 1869 10 produced
No. 188 “House Wettin” on a company photo by Schwartzkopff PD

On the Royal Saxon State Railways, class VII referred to four-coupled tender locomotives which were suitable for both passenger and freight trains. In addition to 22 locomotives from Sächsische Maschinenfabrik Hartmann, there was a design by Schwartzkopff from Berlin, which was also known as Schw. VII. At the time these locomotives were ordered, the Saxon State Railways were still divided into a western and an eastern part. In this case, the Western State Railway needed a new locomotive for the newly opened section between Freiberg and Flöha on the Dresden-Werdau route.

They were constructed according to modern principles and had an inside plate frame, outside cylinders and Allan valve gear. Since only a regulator attachment was used to extract the saturated steam instead of a steam dome, the locomotive made a clean impression with its little obstructed boiler. Only the Belpaire firebox interrupted the clear lines of the boiler barrel. 

Ten machines were procured, which were named after people with important connections to Saxony, Saxon noble families and cities. They were taken over by the combined Saxon State Railways in 1871 and only received the designation VII there. They were retired between 1893 and 1906.

Technical data

General

Built
1869
Manufacturers
BMAG
Wheel arrangement
0-4-0 (Four-coupled)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Empty mass
24.1 t
Service mass
27.8 t
Adhesion mass
27.8 t
Axle load
13.9 t
Water capacity
5,660 l
Fuel capacity
2 t (coal)

Boiler

Grate area
1.2 m²
Firebox surface
6.6 m²
Tube heating surface
87 m²
Evaporative heating surface
93.6 m²
Total heating surface
93.6 m²

Power plant

Driver diameter
1,525 mm
Boiler pressure
8.4 bar
Expansion type
simple expansion
Cylinders
two, 420 x 610 mm

Power

Power source
steam
Estimated power
200 kW (272 PS)
Starting effort
50.4 kN

Calculated values

Factor of adhesion
1 : 5.41
Optimal speed
24 km/h
Power-to-weight ratio
7.2 kW/t
Heating Surface Equivalent
126.6 m²
Cylinder volume/HSE
1 : 1,335.10
Adhesive weight/Total
1 : 1.00
Tractive force/Heating surface
1 : 11.24
Grate area/Heating surface
1 : 78.00
Firebox/Tube surface
1 : 13.18
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