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Saxon I M

Hartmann works photo

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 b...

	Saxon I M Remove
Variant	Standard
Built	1902
Manufacturers	Hartmann
Wheel arrangement	BB t df
Gauge	1000 mm
Length	10490 mm
Service mass	41800 kg
Top speed	30 km/h
Power
Engine

General

Property	Saxon I M Standard Remove
Built	1902
Manufacturers	Hartmann
Wheel arrangement	0-4-4-0T (Double Fairlie)
Gauge	1,000 mm

Dimensions and weights

Property	Saxon I M Standard Remove
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

Property	Saxon I M Standard Remove
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

Property	Saxon I M Standard Remove
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

Property	Saxon I M Standard Remove
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

Property	Saxon I M Standard Remove
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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