GWR 2021 Class

Axle load13 long tons 12+3/4 cwt (29,200 lb or 13.3 t)
(13.9 t; 15.3 short tons) full^[1]Loco weight40 long tons 13+3/4 cwt (89,700 lb or 40.7 t)
(41.3 t; 45.6 short tons) full ^[1]Fuel typeCoalWater cap.1,000 imp gal (4,500 L; 1,200 US gal)^[1]Firebox:​ • Grate area14.5 sq ft (1.35 m²)^[1]Boiler:
​ • ModelGWR 2021^[4] • Pitch6 ft 0+3⁄4 in (1.848 m)^[1] • DiameterBarrel: 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 pressure150 lbf/in² (1.03 MPa)^[1]Heating surface:​ • Firebox92.5 sq ft (8.59 m²)^[1] • Tubes926.25 sq ft (86.051 m²)^[1] • Total surface1,018.75 sq ft (94.645 m²)^[1]CylindersTwo, insideCylinder sizeLoco brakeSteam^[5]

Performance figures
Tractive effort	16,830 lbf (74.86 kN)[1]

Career
Operators	Great Western Railway British Railways
Class	2021
Number in class	140
Numbers	2021–2160[1]
Locale	Western Region
Withdrawn	1944–57[6]
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 0-6-0ST 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]

See also

• GWR 0-6-0PT – list of classes of GWR 0-6-0 pannier tank, including table of preserved locomotives

References

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.