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The reference for locomotives and railcars

Saxon I M

German Reichsbahn class 9916

Germany 1902 3 produced
Hartmann works photo PD

For freight traffic on the Reichenbach-Oberheinsdorf line, one of only two metre-gauge lines in Saxony, the Saxon State Railways got three Fairlie locomotives in 1902 which they designated I M. They had two two-axle bogies with a two-cylinder compound engine each, which were fed by two separated fireboxes in the middle of the boiler. The roof spanned the whole length of the locomotive. Since the tracks were located on the street in many places, the running gear was covered.

When taken over by the Reichsbahn in the twenties, the locomotives were numbered 99 161 to 99 163. Soon the roofs over the boiler barrel were removed. In World War II, 99 163 was shipped to Crimea, but the ship was sunken on its way. The remaining two were retired in 1963. 99 162 was preserved and on static display at Dresden between 1971 and 1974. Previously, the roof had been restored to its original form. Today it can be found at Oberheinsdorf, a former station on the line where it once operated.

Technical data

General

Built
1902
Manufacturers
Hartmann
Wheel arrangement
0-4-4-0T (Double Fairlie)
Gauge
1,000 mm (Meter gauge)

Dimensions and weights

Length
10.49 m
Wheelbase
7.60 m
Empty mass
33.1 t
Service mass
41.8 t
Adhesion mass
41.8 t
Rigid wheelbase
1.10 m
Axle load
10.5 t
Water capacity
3,200 l
Fuel capacity
1.2 t (coal)

Boiler

Grate area
1.8 m²
Firebox surface
7.8 m²
Tube heating surface
71.3 m²
Evaporative heating surface
79.1 m²
Total heating surface
79.1 m²

Power plant

Driver diameter
750 mm
Boiler pressure
14 bar
Expansion type
compound
Cylinders
four, HP: 280 x 380 mm and LP: 430 x 380 mm

Power

Power source
steam
Indicated power
243 kW (330 PS)
Top speed
30 km/h
Starting effort
66.4 kN
Starting effort simple
79.7 kN

Calculated values

Factor of adhesion
1 : 6.18
Optimal speed
23 km/h
Power-to-weight ratio
5.8 kW/t
Heating Surface Equivalent
118.1 m²
Cylinder volume/HSE
1 : 863.51
Adhesive weight/Total
1 : 1.00
Tractive force/Heating surface
1 : 17.53
Grate area/Heating surface
1 : 43.94
Firebox/Tube surface
1 : 9.14
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