loco-info.com - North Wales Narrow Gauge “Moel Tryfan” and “Snowdon Ranger”

“Moel Tryfan” on a works photo

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.

General
Built	1875
Manufacturer	Vulcan
Wheel arr.	0-6-4T (Single Fairlie)
Gauge	1 ft 11 1/2 in (Narrow gauge)

Dimensions and Weights
Wheelbase	14 ft 11 1/2 in
Rigid wheelbase	3 ft 6 in
Service weight	32,481 lbs
Adhesive weight	23,521 lbs
Water capacity	432 us gal
Fuel capacity	1,344 lbs (coal)

Boiler
Grate area	6 sq ft
Firebox area	37.5 sq ft
Tube heating area	324.5 sq ft
Evaporative heating area	362 sq ft
Total heating area	362 sq ft

Power Plant
Driver diameter	30 in
Boiler pressure	140 psi
Expansion type	simple
Cylinders	two, 8 1/2 x 14 in

Power
Power source	steam
Estimated power	100 hp (75 kW)
Starting effort	4,012 lbf

Calculated Values
Factor of adhesion	1 : 5.86
Optimal speed	16 mph
Power-to-weight ratio	0.0031 hp/lb
Heating Area Equivalent	549.5 sq ft
Cylinder volume/HAE	1 : 510.01
Adhesive weight/Total	1 : 1.38
Tractive force/Heating area	1 : 2491.52
Grate area/Heating area	1 : 54.12
Firebox/Tube area	1 : 8.65

steam locomotive

freight

passenger

narrow gauge

tank locomotive

single Fairlie

last changed: 03/2023

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