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GWR 4575 Class information


GWR 4575 class
4598, freshly repaired at Swindon Works
Type and origin
Power typeSteam
DesignerCharles Collett
BuilderGWR Swindon Works
Order numberLots 242, 249, 251, 253
Build date1927–1929
Total produced100
Specifications
Configuration:
​
 • Whyte2-6-2T
 • UIC1′C1′ h2t
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.3 ft 2 in (0.965 m)
Driver dia.4 ft 7+1⁄2 in (1.410 m)
Trailing dia.3 ft 2 in (0.965 m)
Minimum curve5 chains (330 ft; 100 m) normal,
4.5 chains (300 ft; 91 m) slow
Wheelbase26 ft 10 in (8.18 m)
Length36 ft 4+1⁄2 in (11.09 m) over buffers
Width8 ft 9 in (2.667 m)
Height13 ft 0 in (3.962 m)
Axle load15 long tons 11 cwt (34,800 lb or 15.8 t)
(17.4 short tons) full
Adhesive weight46 long tons 5 cwt (103,600 lb or 47 t)
(51.8 short tons) full
Loco weight61 long tons 0 cwt (136,600 lb or 62 t)
(68.3 short tons) full
Fuel typeCoal
Fuel capacity3 long tons 14 cwt (8,300 lb or 3.8 t)
Water cap.1,300 imp gal (5,900 L; 1,600 US gal)
Firebox:​
 • Grate area16.6 sq ft (1.54 m2)
BoilerGWR Standard No. 5[1]
Boiler pressure200 lbf/in2 (1.38 MPa)
Heating surface:​
 • Firebox94.25 sq ft (8.756 m2)
 • Tubes992.51 sq ft (92.207 m2)
Superheater:
​
 • Type4-element or 6-element
 • Heating area4-element: 52.98 sq ft (4.922 m2),
6-element: 69.84 sq ft (6.488 m2)
CylindersTwo, outside
Cylinder size17 in × 24 in (432 mm × 610 mm)
Valve gearStephenson
Valve typepiston valves
Train brakesVacuum
Performance figures
Tractive effort21,250 lbf (94.5 kN)
Career
OperatorsGWR » BR
Class4575
Power classGWR: C,
BR: 4MT
Number in class100
Numbers4575–4599, 5500–5574
NicknamesSmall Prairie
Axle load classGWR: Yellow
Withdrawn1956–1964
Preserved4588, 5521, 5526, 5532, 5538, 5539, 5541, 5542, 5552, 5553, 5572
Disposition11 preserved, remainder scrapped

The Great Western Railway (GWR) 4575 Class is a class of 2-6-2T British steam locomotives.

  1. ^ Champ (2018), p. 319.

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