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Specifications
Specifications
Configuration:;
• Whyte	0-6-0ST
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 1+1⁄2 in (1.257 m)
Wheelbase	7 ft 4 in (2.24 m) + 7 ft 4 in (2.24 m), total 14 ft 8 in (4.47 m)
Length	30 ft 1 in (9.17 m) over buffers
Width	8 ft 2 in (2.49 m)
Height	11 ft 10+3⁄8 in (3.62 m)
Frame type	Type: Inside; Length: 25 ft 8 in (7.82 m); Width: 7 ft 7 in (2.31 m);
Axle load	13 long tons 12+3/4 cwt (29,200 lb or 13.3 t); (13.9 t; 15.3 short tons) full
Loco weight	40 long tons 13+3/4 cwt (89,700 lb or 40.7 t); (41.3 t; 45.6 short tons) full
Fuel type	Coal
Water cap.	1,000 imp gal (4,500 L; 1,200 US gal)
Firebox:
• Grate area	14.5 sq ft (1.35 m2)
Boiler:;
• Model	GWR 2021
• Pitch	6 ft 0+3⁄4 in (1.848 m)
• Diameter	Barrel: 10 ft 0 in (3.05 m) ; Outside diameter: 3 ft 9+7⁄8 in (1.165 m) and 3 ft 9 in (1.14 m)
Boiler pressure	150 lbf/in2 (1.03 MPa)
Heating surface:
• Firebox	92.5 sq ft (8.59 m2)
• Tubes	926.25 sq ft (86.051 m2)
• Total surface	1,018.75 sq ft (94.645 m2)
Cylinders	Two, inside
Cylinder size	Diameter: 16+1⁄2 in (419 mm); Stroke: 24 in (610 mm);
Loco brake	Steam

Type and origin
Type and origin
Power type	Steam
Designer	George Armstrong
Builder	Wolverhampton, GWR
Order number	Lots: D3, F3, G3, H3, J3, K3, L3, M3
Serial number	Works Nos: 625–764
Build date	1897 – 1905
Total produced	140

GWR 2021 Class
GWR 2021 Class
	No. 2080 at Berkeley Road station 1948
Power type
Type and origin
Power type	Steam
Designer	George Armstrong
Builder	Wolverhampton, GWR
Order number	Lots: D3, F3, G3, H3, J3, K3, L3, M3
Serial number	Works Nos: 625–764
Build date	1897 – 1905
Total produced	140
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-0ST
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 1+1⁄2 in (1.257 m)
Wheelbase	7 ft 4 in (2.24 m) + 7 ft 4 in (2.24 m), total 14 ft 8 in (4.47 m)
Length	30 ft 1 in (9.17 m) over buffers
Width	8 ft 2 in (2.49 m)
Height	11 ft 10+3⁄8 in (3.62 m)
Frame type	Type: Inside; Length: 25 ft 8 in (7.82 m); Width: 7 ft 7 in (2.31 m);
Axle load	13 long tons 12+3/4 cwt (29,200 lb or 13.3 t); (13.9 t; 15.3 short tons) full
Loco weight	40 long tons 13+3/4 cwt (89,700 lb or 40.7 t); (41.3 t; 45.6 short tons) full
Fuel type	Coal
Water cap.	1,000 imp gal (4,500 L; 1,200 US gal)
Firebox:
• Grate area	14.5 sq ft (1.35 m2)
Boiler:;
• Model	GWR 2021
• Pitch	6 ft 0+3⁄4 in (1.848 m)
• Diameter	Barrel: 10 ft 0 in (3.05 m) ; Outside diameter: 3 ft 9+7⁄8 in (1.165 m) and 3 ft 9 in (1.14 m)
Boiler pressure	150 lbf/in2 (1.03 MPa)
Heating surface:
• Firebox	92.5 sq ft (8.59 m2)
• Tubes	926.25 sq ft (86.051 m2)
• Total surface	1,018.75 sq ft (94.645 m2)
Cylinders	Two, inside
Cylinder size	Diameter: 16+1⁄2 in (419 mm); Stroke: 24 in (610 mm);
Loco brake	Steam
Tractive effort
Performance figures
Tractive effort	16,830 lbf (74.86 kN)
Operators
Career
Operators	Great Western Railway; British Railways
Class	2021
Number in class	140
Numbers	2021–2160
Locale	Western Region
Withdrawn	1944–57
Disposition	All scrapped

GWR 2101 Class (differences from 2021 Class)

Specifications
Axle load	14 long tons 6 cwt (32,000 lb or 14.5 t) (14.5 t; 16.0 short tons) full^[7]
Loco weight	41 long tons 0 cwt (91,800 lb or 41.7 t) (41.7 t; 45.9 short tons) full^[7]
Firebox:
• Grate area	14.7 sq ft (1.37 m²)^[7]
Boiler	Outside diameter: 3 ft 10 in (1.17 m) and 3 ft 9 in (1.14 m)^[7]
Boiler pressure	165 lbf/in² (1.14 MPa)^[7]
Heating surface:
• Firebox	95.81 sq ft (8.901 m²)^[7]
• Tubes	958.32 sq ft (89.031 m²)^[7]
• Total surface	1,054.13 sq ft (97.932 m²)^[7]

Performance figures
Tractive effort	18,515 lbf (82.36 kN)^[7]

Career
Class	2101

The GWR 2021 Class was a class of 140 0-6-0 ST steam locomotives. They were built at the Wolverhampton railway works of the Great Western Railway between 1897 and 1905. 1897 was the very year of George Armstrong's retirement, so it is uncertain if the design should be attributed to him or to his superior at Swindon, William Dean.

In fact the 2021s were simple enlargements of the Armstrong-designed 850 class of 1874. The changes were fundamentally confined to a longer wheelbase to permit fitting of a larger firebox.

History

The class was built in eight batches:

2021-2030 (Lot D3, 1897)
2031-2040 (Lot F3, 1897–8)
2041-2060 (Lot G3, 1898–9)
2061-2080 (Lot H3, 1899–1900)
2081-2100 (Lot J3, 1900–01)
2101-2120 (Lot K3, 1902–3)
2121-2140 (Lot L3, 1903–4)
2141-2160 (Lot M3, 1904–5)

Rebuilding with Belpaire fireboxes commenced in the early years of the Churchward era. Unsuccessful attempts to form a saddle tank around the firebox directly led to the switch to pannier tanks. The first pannier tank conversions occurred in 1912, and rebuilding of the majority of the class took place over many years – the last conversion was in 1948, and some were still saddle tanks when withdrawn.^[8] In their final form, with or without fully enclosed cabs, 110 of them survived into British Railways ownership, the last of them being retired in 1959.^[9] They were superseded by the short-lived GWR 1600 Class, nominally a Hawksworth design, but in reality a straightforward update of the then 75-year-old design, with new boiler, bigger cab and bunker.

Coachwork

When autotrains were introduced on the GWR, a trial was made of enclosing the engine in coachwork to resemble the coaches. Nos 2120 and 2140 of this class were so equipped in 1906, as were two 517 class 0-4-2Ts. The experiment was unpopular with engine crews, and the bodywork removed in 1911.^[10]^[11]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t le Fleming 1958, p. E50.
^ ^a ^b ^c ^d Whitehurst 1973, p. 152.
^ le Fleming 1958, p. E5.
^ Champ, Jim (2018). An Introduction to Great Western Locomotive Development. Barnsley: Pen & Sword Transport. p. 319. ISBN 978-1-4738-7784-9. OCLC 1029234106. OL 26953051M.
^ le Fleming 1958, p. E11.
^ Whitehurst 1973, pp. 21–23.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ le Fleming 1958, p. E51.
^ le Fleming 1958, pp. E53–E55.
^ "2069". 31 December 2013.
^ Darkin, Peter. "BRANCH LINES October 2019". svrlive. Retrieved 15 June 2022.
^ Norris, John (1987). Edwardian enterprise : a review of Great Western Railway development in the first decade of this century. Didcot: Wild Swan. p. 127. ISBN 0906867398.

Sources

Ian Allan ABC of British Railways Locomotives, 1948 edition, part 1, pp 16,51
le Fleming, H. M. (April 1958). White, D. E. (ed.). The Locomotives of the Great Western Railway, part five: Six-coupled Tank Engines. RCTS. ISBN 0-901115-35-5. OCLC 500544510.
Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. ISBN 978-0-9028-8821-0. OCLC 815661.