Dutch Railways series 4700
In World War II, when the Dutch exile government expected a severe shortage of locomotives after the war, they ordered two types of steam locomotives from NoHAB of Sweden. For freight service, 35 0-8-0 locomotives were ordered which were directly based on the TGOJ M3b. They were delivered after the end of the war and numbered in the range from 4701 to 4735. The other type were the 15 4-6-0 locomotives of the series 4000.
Three cylinders were unusual for the Netherlands, but gave them the highest tractive effort of any steam locomotive in the country. The fully enclosed cab was a sign for the Nordic origin of these locomotives. The electric lighting of the running gear, what was also not common in the Netherlands, earned them the nickname “Kerstboom” (“Christmas tree”).
Although they had been designed for freight service, their third cylinder ensured good running characteristics up to 70 km/h. So they were also used in passenger service when needed. As electrification progressed, they were used almost exclusively for coal traffic in Limburg in the fifties. Their withdrawals followed until 1957.
Technical data
General
- Built
- 1945-1946
- Manufacturers
- NoHAB
- Wheel arrangement
- 0-8-0 (Eight-coupled)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 19.28 m
- Wheelbase
- 4.95 m
- Service mass
- 74.8 t
- Adhesion mass
- 74.8 t
- Total mass
- 121 t
- Rigid wheelbase
- 4.95 m
- Axle load
- 18.7 t
- Water capacity
- 22,500 l
- Fuel capacity
- 7 t (coal)
Boiler
- Grate area
- 3.02 m²
- Firebox surface
- 12.3 m²
- Tube heating surface
- 135.8 m²
- Evaporative heating surface
- 148.1 m²
- Superheater surface
- 48.5 m²
- Total heating surface
- 196.6 m²
Power plant
- Driver diameter
- 1,350 mm
- Boiler pressure
- 13 bar
- Expansion type
- simple expansion
- Cylinders
- three, 500 x 660 mm
Power
- Power source
- steam
- Indicated power
- 1,250 kW (1,700 PS)
- Top speed
- 70 km/h
- Starting effort
- 202.6 kN
Calculated values
- Factor of adhesion
- 1 : 3.62
- Optimal speed
- 37 km/h
- Power-to-weight ratio
- 16.7 kW/t
- Heating Surface Equivalent
- 306.6 m²
- Cylinder volume/HSE
- 1 : 1,268.01
- Adhesive weight/Total
- 1 : 1.00
- Tractive force/Heating surface
- 1 : 21.52
- Grate area/Heating surface
- 1 : 65.10
- Firebox/Tube surface
- 1 : 11.04
- Total/Superheater
- 1 : 3.05