North Wales Narrow Gauge “Moel Tryfan” and “Snowdon Ranger”
Great Britain 1875 2 produced
The North Wales Narrow Gauge Railways, which opened in 1877, were built to the unusual one foot 11 1/2 inch gauge. Their first two locomotives were two Single Fairlies, that is, with a power bogie and a trailing bogie. In 1917 both were combined into one working locomotive due to their poor condition. From 1923 it belonged to the Welsh Highland Railway and it is unclear whether they also used it on the Ffestiniog Railway and reduced their height to do so. It was retired in 1937 and not refurbished after the Ffestiniog Railway reopened.
Technical data
General
- Built
- 1875
- Manufacturers
- Vulcan
- Wheel arrangement
- 0-6-4T (Single Fairlie)
- Gauge
- 597 mm
Dimensions and weights
- Wheelbase
- 4.56 m
- Service mass
- 14.7 t
- Adhesion mass
- 10.7 t
- Rigid wheelbase
- 1.07 m
- Water capacity
- 1,635 l
- Fuel capacity
- 0.6 t (coal)
Boiler
- Grate area
- 0.557 m²
- Firebox surface
- 3.484 m²
- Tube heating surface
- 30.147 m²
- Evaporative heating surface
- 33.631 m²
- Total heating surface
- 33.6 m²
Power plant
- Driver diameter
- 762 mm
- Boiler pressure
- 9.7 bar
- Expansion type
- simple expansion
- Cylinders
- two, 216 x 356 mm
Power
- Power source
- steam
- Estimated power
- 75 kW (102 PS)
- Starting effort
- 17.8 kN
Calculated values
- Factor of adhesion
- 1 : 5.86
- Optimal speed
- 26 km/h
- Power-to-weight ratio
- 5.1 kW/t
- Heating Surface Equivalent
- 51.1 m²
- Cylinder volume/HSE
- 1 : 510.01
- Adhesive weight/Total
- 1 : 1.38
- Tractive force/Heating surface
- 1 : 11.08
- Grate area/Heating surface
- 1 : 60.38
- Firebox/Tube surface
- 1 : 8.65
