North Wales Narrow Gauge “Gowrie”
In 1906 construction began on the Porthmadog, Beddgelert and South Snowdon Railway, which was to become an extension of the North Wales Narrow Gauge Railways. Although the line was to be electrified, steam locomotives were initially ordered from Hunslet. One these was the “Gowrie”, which was not delivered until after construction had been halted. It was named after the manager of the planned railway line, Gowrie Colquhoun Aicheson.
Like all of the NWNGR, the Gowrie was built in 1 foot 11 1/2 inch gauge. It is considered to be the last locomotive built for this company. Due to the very tight curves, the locomotive was built as a Single Fairlie. This meant that the three coupled axles were in a front bogie and the two trailing axles in a rear bogie.
The loco was not as successful as the “Moel Tryfan” and “Snowdon Ranger” which had been combined into a single loco in 1917. The “Gowrie” was sold in 1918 and went through several owners. It was almost bought back when the Welsh Highland Railway was founded, but ultimately this did not happen. It was seen for the last time in service in 1928 and was scrapped in 1931.
Technical data
General
- Built
- 1908
- Manufacturers
- Hunslet
- Wheel arrangement
- 0-6-4T (Single Fairlie)
- Gauge
- 597 mm
Dimensions and weights
- Wheelbase
- 5.18 m
- Service mass
- 18.3 t
- Adhesion mass
- 11.5 t
- Rigid wheelbase
- 1.68 m
- Axle load
- 3.8 t
- Water capacity
- 1,817 l
- Fuel capacity
- 1 t (coal)
Boiler
- Grate area
- 0.465 m²
- Firebox surface
- 2.787 m²
- Tube heating surface
- 23.412 m²
- Evaporative heating surface
- 26.199 m²
- Total heating surface
- 26.2 m²
Power plant
- Driver diameter
- 724 mm
- Boiler pressure
- 11 bar
- Expansion type
- simple expansion
- Cylinders
- two, 235 x 356 mm
Power
- Power source
- steam
- Estimated power
- 67 kW (91 PS)
- Starting effort
- 25.4 kN
Calculated values
- Factor of adhesion
- 1 : 4.43
- Optimal speed
- 16 km/h
- Power-to-weight ratio
- 3.7 kW/t
- Heating Surface Equivalent
- 40.1 m²
- Cylinder volume/HSE
- 1 : 768.28
- Adhesive weight/Total
- 1 : 1.59
- Tractive force/Heating surface
- 1 : 20.27
- Grate area/Heating surface
- 1 : 56.34
- Firebox/Tube surface
- 1 : 8.40