GWR 6100 Class

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GWR 6100 Class
GWR 2-6-2T 6147 at Swindon Works (level adjusted).jpg
6147 at Swindon Works on 26 April 1964 after overhaul
Type and origin
Power type Steam
Designer Charles Collett
Builder GWR Swindon Works
Order number Lots 269, 278, 291
Build date 1931–1933, 1935
Total produced 70
 • Whyte 2-6-2T
 • UIC 1'C1 ht
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Leading dia. 3 ft 2 in (0.965 m)
Driver dia. 5 ft 8 in (1.727 m)
Trailing dia. 3 ft 8 in (1.118 m)
Minimum curve 6 chains (396 ft; 121 m) normal,
5 chains (330 ft; 101 m) slow
Length 41 ft 0 in (12.50 m) over buffers
Width 8 ft 11 14 in (2.724 m)
Height 12 ft 7 58 in (3.851 m)
Axle load 17 long tons 12 cwt (39,400 lb or 17.9 t)
19.7 short tons full
Adhesive weight 52 long tons 13 cwt (117,900 lb or 53.5 t)
58.9 short tons full
Loco weight 78 long tons 9 cwt (175,700 lb or 79.7 t)
87.9 short tons full
Fuel type Coal
Water cap 2,000 imp gal (9,100 l; 2,400 US gal)
 • Firegrate area
20.35 sq ft (1.891 m2)
Boiler pressure 225 lbf/in2 (1.55 MPa)
Heating surface:
 • Tubes
1,145.00 sq ft (106.374 m2)
 • Firebox 121.80 sq ft (11.316 m2)
 • Type 4-element or 6-element
 • Heating area 4-element: 58.56 sq ft (5.440 m2),
6-element: 77.68 sq ft (7.217 m2)
Cylinders Two, outside
Cylinder size 18 in × 30 in (457 mm × 762 mm)
Valve gear Stephenson
Valve type piston valves
Performance figures
Tractive effort 27,340 lbf (121.61 kN)
Operators GWR » BR
Class 6100
Power class GWR: D
Numbers 6100–6169
Axle load class GWR: Blue
Withdrawn 1958–1965
Disposition One preserved, remainder scrapped

The GWR 6100 Class is a class of 2-6-2T side tank steam locomotives.


6165 at Reading with train of mineral wagons in May 1964

The class was designed by Charles Collett and introduced in 1931, and were a straightforward development of the earlier 5101 class (and for that matter the 1905 3100/5100 class). The main difference from their predecessors was an increased boiler pressure of 225 psi (1.55 MPa) with a consequent increase in tractive effort.[1]

There were seventy in the class, built in two batches in 1931–1933 and 1935. They were frequently referred to by trainspotters as 'Tanner One-ers'- being a reference to their '61xx' numbering sequence using colloquial terms for a sixpence and a penny.

The class was specifically built for commuter services in the London area where they replaced the ageing 2221 class on these services. They lasted to the end of steam on the Western Region of British Railways in 1965, never straying far from their home turf. Typical duties were Paddington to Aylesbury via High Wycombe, and from the same terminus to Oxford, Windsor, Reading and Basingstoke. They were mainly shedded at Old Oak Common, Southall, Slough, Reading and Aylesbury throughout their lives. In the early 1960s, the advent of the first generation diesel multiple units made them semi-redundant though generally far from worn out. Their last few years saw them on more menial duties, as in the adjacent photograph, until scrapping.[1]


6106 at Didcot

One locomotive, 6106, has survived into preservation, and is at Didcot Railway Centre, though currently non-operational.[2]


The erstwhile Kitmaster company produced an unpowered polystyrene injection moulded model kit for 00 gauge. In late 1962, the Kitmaster brand was sold by its parent company (Rosebud Dolls) to Airfix, who transferred the moulding tools to their own factory; they re-introduced some of the former Kitmaster range, including this model. The tools were subsequently sold again to Dapol who have also produced this model.[3]

Triang also produced a powered model of 6157 in TT scale[4]

For some time Graham Farish have produced a N gauge model, it is dated compared with more modern models and its driving wheels are scale for the 3100 class, i.e. 5ft 3 inches, but is still a reasonable representation which forms a good base to add detail too.[citation needed]

See also[edit]


  1. ^ a b le Fleming, H.M. (February 1962). White, D.E., ed. The Locomotives of the Great Western Railway, part nine: Standard Two-Cylinder Classes. RCTS. p. J33-J34.
  2. ^ 6106 at Didcot Railway Centre (Accessed 2008-11-02)
  3. ^ Knight, Stephen (1999). Let's Stick Together: An Appreciation of Kitmaster and Airfix Railway Kits. Clopthill: Irwell Press. ISBN 1-871608-90-2.
  4. ^ see the Triang Catalogue at
  • Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. pp. 56, 102, 136. ISBN 978-0-9028-8821-0. OCLC 815661.

External links[edit]