GWR 633 Class

The GWR 633 Class were 0-6-0Ts designed by George Armstrong and built at the Wolverhampton railway works of the Great Western Railway between November 1871 and April 1872. These were always Southern Division locomotives, but over the years some were fitted to work the Metropolitan lines and played a large role in the transportation of goods from Acton to Smithfield. Unusually, they had side (not saddle) tanks, and inside frames, with wheels of 4 ft 6+12 in (1,384 mm) in diameter and a wheelbase of 15 ft 6 in (4.72 m). Their weight was 34 long tons 12 cwt (35.2 t; 38.8 short tons). There were twelve locomotives, numbered 633–644.

GWR 633 Class
Type and origin
Power typeSteam
DesignerGeorge Armstrong
BuilderGWR Wolverhampton Works
Order numberM
Serial number167–178
Build date1871-1872
Total produced12
Specifications
Configuration:
  Whyte0-6-0T
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Driver dia.4 ft 6+12 in (1,384 mm)
Wheelbase15 ft 6 in (4.72 m)
Loco weight34 long tons 12 cwt (35.2 t; 38.8 short tons)
Cylinder size16 in × 24 in (406 mm × 610 mm) dia × stroke
Career
OperatorsGreat Western Railway
Class633
Numbers633–644
Withdrawn1928-1934
DispositionAll scrapped
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