GWR 3100 Class

4 ft 8+1⁄2 in (1,435 mm) standard gaugeLeading dia.3 ft 0 in (0.914 m)Driver dia.5 ft 3 in (1.600 m)Trailing dia.3 ft 8 in (1.118 m)Minimum curve6 chains (396 ft; 121 m) normal,
5 chains (330 ft; 101 m) slowLength41 ft 0 in (12.50 m) over buffersWidth8 ft 11+1⁄4 in (2.724 m)Height13 ft 2 in (4.013 m)Axle load19 long tons 3 cwt (42,900 lb or 19.5 t)
(21.4 short tons) fullAdhesive weight57 long tons 6 cwt (128,400 lb or 58.2 t)
(64.2 short tons) fullLoco weight81 long tons 9 cwt (182,400 lb or 82.8 t)
(91.2 short tons) fullFuel typeCoalWater cap.2,000 imp gal (9,100 L; 2,400 US gal)Firebox:​ • Grate area20.56 sq ft (1.910 m²)BoilerGWR Standard No. 4Boiler pressure225 lbf/in² (1.55 MPa)Heating surface:​ • Firebox128.72 sq ft (11.958 m²) • Tubes1,349 sq ft (125.3 m²)Superheater:
​ • Type4-element or 6-element • Heating area4-element: 136.64 sq ft (12.694 m²),
6-element: 181.10 sq ft (16.825 m²)CylindersTwo, outsideCylinder size18.5 in × 30 in (470 mm × 762 mm)

Performance figures
Tractive effort	31,170 lbf (138.7 kN)

Career
Operators	GWR » BR
Class	3100
Power class	GWR: D, BR: 4MT
Numbers	3100–3104
Axle load class	GWR: Red
Withdrawn	1957–1960
Disposition	All scrapped

The Great Western Railway (GWR) 3100 Class was a class of 2-6-2T side tank steam locomotive.

History

This class of large prairie was created in 1938 when Collett rebuilt some of Churchward's 3150 Class with a view to using them as bankers, particularly from Severn Tunnel Junction shed. These engines used the standard class 4 boiler again, but pressed to 225 psi (1,550 kPa). and using smaller coupled wheels of 5 feet 3 inches (1.600 m) diameter, and one-half inch (13 mm) increase in cylinder diameter, nominal tractive effort rose to 31,170 pounds (14,140 kg). Almost impossible to pick out was a 2 in (50.8 mm) reduction in pony truck wheel diameter to 3 ft 0 in (914 mm). Only five engines were ever modified, namely 3173, 3156, 3181, 3155 and 3179 which were rebuilt as 3100 to 3104 respectively. None of these were preserved.

See also

• GWR 3100/5100 Class (1906)
• GWR 3150 Class
• GWR 5101 Class
• GWR 6100 Class
• GWR 8100 Class
• List of GWR standard classes with two outside cylinders

References

• Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. pp. 30, 102, 135. ISBN 978-0-9028-8821-0. OCLC 815661.

External links

• Class 3100 Details at Rail UK