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North Wales Narrow Gauge “Gowrie”

Great Britain 1908 1 produced
Locomotive Magazine, January 1909

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
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