GWR 101 Class

Specifications
Specifications
Configuration:;
• Whyte	0-4-0T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Coupled dia.	3 ft 8 in (1.118 m)
Wheelbase	9 ft (2.743 m)
Fuel type	Oil (Original) ; Coal (Rebuilt)
Cylinders	Two, outside
Cylinder size	13 in × 22 in (330 mm × 559 mm)
Valve gear	Joy valve gear

Type and origin
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lot 136
Serial number	1969
Build date	1902
Total produced	1 (prototype)
Rebuild date	1905

GWR 101 Class
GWR 101 Class
	101 after conversion to burn coal in 1905
Power type
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lot 136
Serial number	1969
Build date	1902
Total produced	1 (prototype)
Rebuild date	1905
Configuration:;
Specifications
Configuration:;
• Whyte	0-4-0T
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Coupled dia.	3 ft 8 in (1.118 m)
Wheelbase	9 ft (2.743 m)
Fuel type	Oil (Original) ; Coal (Rebuilt)
Cylinders	Two, outside
Cylinder size	13 in × 22 in (330 mm × 559 mm)
Valve gear	Joy valve gear
Operators
Career
Operators	GWR
Numbers	101
Withdrawn	1911
Disposition	Scrapped

The GWR 101 Class consisted of a single experimental 0-4-0T side-tank steam locomotive. It was built at GWR Swindon Works under the direction of George Jackson Churchward in June 1902.^[1]^[2]

Originally built as an oil-burning locomotive 'on Holden's system'^[2]^[a], it had an unusual boiler containing a firebox constructed as an arched chamber made from fire-bricks, opening to the firetubes in front, and with two oil-burning nozzles at the back. Over this was mounted a short saddle tank for the oil fuel. There was no outer firebox, but the 8 ft × 5 ft (2.438 m × 1.524 m) boiler, pressed to 180 psi (1.2 MPa), contained 289 firetubes in the lower part and a large steam space above.

As soon as July 1902, it was redesigned with a smaller firebox and a single burner. It was given a Lentz boiler with a cylindrical corrugated firebox inside the barrel in 1903. The saddle tank for fuel was removed and oil stored at the rear end of the side tanks. In 1905, the locomotive was rebuilt as a coal burner, with the cab backplate replaced by a bunker.

It was intended for light passenger service on the Wrington Vale Light Railway near Bristol. However, due to technical issues associated with the design, the locomotive never saw the intended service. It remained at Swindon Works, used as a works shunter. No further engines were built to this design, and the locomotive was withdrawn and scrapped in 1911.^[1]^[2]

Despite it being a unique, obscure and short-lived experimental loco, Hornby have been producing a 00 scale model of No. 101 since 1978, in many prototypical and non-prototypical guises. It is currently sold as part of the Railroad range.^[4] Hornby have sometimes inaccurately ascribed the whole design to Holden, instead of just the oil-burning mechanism.^[5]

Notes

^ James Holden left the GWR in 1885 for the GER, where he developed oil burning technology for steam locomotives, being granted a patent for it^[3] in 1899.

^ ^a ^b Haresnape 1976.
^ ^a ^b ^c Tabor 1959, pp. F45–F46.
^ "Espacenet – search results". worldwide.espacenet.com. Retrieved 18 August 2021.
^ HornbyGuide 2016.
^ Hornby 1978.

References

Haresnape, Brian (1976). Churchward locomotives : a pictorial history. London: I. Allan. ISBN 0-7110-0697-0.
"Hornby Railways Collector Guide - Class - Class 101 Holden Tank - Steam". www.hornbyguide.com. Retrieved 16 August 2016.
Tabor, F.J. (August 1959). White, D.E. (ed.). The Locomotives of the Great Western Railway, part six: Four-Coupled Tank Engines. RCTS. ISBN 0-901115-36-3.
Hornby Railways '00' Model Catalogue 1978. Margate, Kent: Rovex Ltd. 1978. p. 27.