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The reference for locomotives and railcars

Saxon II (state railway type)

Germany 1854 90 produced
“Atlas” on a works photo PD

The Saxon State Railways designated various light locomotives with a 2-4-0 wheel arrangement for use in front of passenger and freight trains as type II. The first type of these locomotives was procured for the state railway for lines which were either directly owned by them or were only operated by the state railway for the owner. In contrast to the locomotives of various private railways that were later procured as class II, the machines of the state railway design were built with relatively few changes. Thus, between 1854 and 1868, a total of 90 examples were built at Sächsische Maschinenfabrik Hartmann.

Some changes during production came about because the technology was developing rapidly at the time and people were also experimenting with new designs. As a result, the design of the valve gear and the transition between the boiler barrel and the smoke box was changed. The boiler pressure on the later engines was also increased to 8.5 bars. Since lignite from Bohemia was burned in some engines, these were fitted with spark arrestors to prevent fires along the line.

In the beginning, as with many other locomotives, there were only brakes on the tender; later, various systems of steam or counter-steam brakes were used. The frame remained on the inside for the entire production time, but gradually changed from a fork frame to a plate frame. 

The type name has changed several times over the years. In the beginning, all locomotives only had consecutive running numbers, whereby the type of a locomotive could only be identified by the number range. From 1871 the older 2-4-0 locomotives of the state railway were designated as H III, from 1885 as H II and from 1896 only as II. In 1900 about half of the locomotives were still in service, since the first decommissioning began in 1882. In 1914 the last ones were finally retired.

Technical data

General

Property lightest variant heaviest variant
Built 1854-1868
Manufacturers Hartmann
Wheel arrangement 2-4-0 (Porter)
Gauge 1,435 mm (Standard gauge)

Dimensions and weights

Property lightest variant heaviest variant
Wheelbase 3.29 m
Service mass 28.9 t 33.9 t
Adhesion mass 21.5 t 25.5 t
Rigid wheelbase 3.29 m
Axle load 10.6 t 12.8 t

Boiler

Property lightest variant heaviest variant
Grate area 1.25 m² 1.3 m²
Evaporative heating surface 81.2 m² 100.7 m²
Total heating surface 81.2 m² 100.7 m²

Power plant

Property lightest variant heaviest variant
Driver diameter 1,525 mm
Boiler pressure 7 bar
Expansion type simple expansion
Cylinders two, 406 x 610 mm

Power

Property lightest variant heaviest variant
Power source steam
Estimated power 275 kW (374 PS)
Starting effort 39.2 kN

Calculated values

Property lightest variant heaviest variant
Factor of adhesion 1 : 5.38 1 : 6.38
Optimal speed 43 km/h
Power-to-weight ratio 9.5 kW/t 8.1 kW/t
Adhesive weight/Total 1 : 1.34 1 : 1.33
Tractive force/Heating surface 1 : 10.09 1 : 8.14
Grate area/Heating surface 1 : 64.96 1 : 77.46
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