GWR 2221 Class

The Great Western Railway (GWR) 2221 Class or County Tank was a class of 4-4-2T steam locomotive, effectively a tank engine version of the 3800 "County" Class 4-4-0 tender locomotives. The two classes had different boilers, standard no 4 for the tender locomotive, and the smaller (by about 350 sq ft or 33 m2) standard no 2 for the tank. 2230 was fitted with the larger boiler when new, but this was unsuccessful and was quickly altered.

GWR 2221 "County Tank" Class
Type and origin
Power typeSteam
DesignerGeorge Jackson Churchward
BuilderSwindon Works
Build date1905–1909, 1912
Total produced30
Specifications
Configuration:
​
 • Whyte4-4-2T
 • UIC2′B1 ht
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver dia.6 ft 8 1⁄2 in (2.045 m)
Fuel typeCoal
Firebox:
 • Firegrate area		20.35 sq ft (1.89 m2)
BoilerGWR No. 2
Boiler pressure200 lbf/in2 (1.38 MPa)
Heating surface1,517.89 sq ft (141.02 m2)
 • Tubes and flues1,396.58 sq ft (129.75 m2)
 • Firebox121.31 sq ft (11.27 m2)
Superheater:
​
 • Heating area82.2 sq ft (7.64 m2)
CylindersTwo, outside
Cylinder size18 in × 30 in (457 mm × 762 mm)
Performance figures
Tractive effort20,530 lbf (91.32 kN)
Career
OperatorsGreat Western Railway
Numbers2221–2250
Withdrawn1931 - 1934
DispositionAll scrapped

Construction

Thirty were built between 1905 and 1912 to replace the 3600 "Birdcage" Class. They were built in three batches of ten, the batches having minor differences. In the final batch the drop in the front framing above the cylinders was curved, the cylinders were also lower, superheaters and top feed were fitted from new. Later in life, the earlier members of the class were fitted with superheaters, and some were given larger bunkers in line with other standard tank classes.[1]

Use

Their work was concentrated on London suburban services. They were replaced by the more versatile GWR 6100 Class from 1931 onwards, the last going in 1934. Their large four coupled driving wheels were suited to high speed running on outer suburban services but acceleration was slower than that of the six coupled, smaller wheeled locomotives.

Reputation

Like the Counties, they had a reputation for rough riding, caused by their short coupled wheelbase and large outside cylinders. None survived into preservation.

References
  1. le Fleming, H.M. (February 1962). White, D.E. (ed.). The Locomotives of the Great Western Railway, part nine: Standard Two-Cylinder Classes. RCTS. pp. J34–J35. ISBN 0-901115-37-1. OCLC 655827210.CS1 maint: ref=harv (link)


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.