GWR 850 Class

From Wikipedia, the free encyclopedia
Jump to: navigation, search
GWR 850 Class
Swindon 01 Works geograph-2566405-by-Ben-Brooksbank.jpg
No. 2007 (withdrawn 12/49) awaiting scrapping at Swindon 1950
Type and origin
Power type Steam
Designer George Armstrong
Builder GWR Wolverhampton works
Build date 1874-1895
Total produced 170
Specifications
Configuration 0-6-0ST
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 4 ft 0 in (1.22 m)
Wheelbase 13 ft 8 in (4.17 m)
Fuel type coal
Cylinders two
Cylinder size 15 in × 24 in (380 mm × 610 mm)
Career
Operator(s) GWR

Class 850 of the Great Western Railway was an extensive class of small 0-6-0 saddle tank locomotives designed by George Armstrong and built at the Wolverhampton Works of the Great Western Railway between 1874 and 1895. Aptly described as the GWR equivalent of the LBS&CR "Terrier" Class of William Stroudley, their wide availability and lively performance gave them long lives, and eventually they were replaced from 1949 by what were in essence very similar locomotives, the short-lived 1600 Class of Frederick Hawksworth, which in the headlong abandonment of steam outlived them by a mere seven years or so.

Construction[edit]

The 850 Class originally consisted of 50 locomotives comprising 48 new and two rebuilds. The rebuilds, Nos. 93 and 94, were supplied in 1875 and 1877 as renewals of the original Gooch locomotives of 1860. Later, as locomotives were rebuilt, the 120 locomotives of the 1901 class were incorporated into the 850 class to make a total of 170 locomotives. It has been claimed [1] that nos. 1216-1227 were part of the 1901 class but this seems unlikely because they were built before the 1901 class was introduced.

850 class
GWR nos. Lot Date built Class No. built Notes
850-861 T 1874 850 12
862-873 V 1874-5 850 12
987-998 X 1875-6 850 12
93-94 - 1875-7 850 2 Rebuilds
1216-1227 Y 1876-7 850 12
Total 850 50
1901 class
GWR nos. Lot Date built Class No. built Notes
1901-1912 J2 1881-2 1901 12
1913-1924 L2 1882 1901 12
1925-1936 O2 1883-4 1901 12
1937-1948 Q2 1886-7 1901 12
1949-1960 R2 1888 1901 12
1961-1972 T2 1889-90 1901 12
1973-1984 V2 1890-91 1901 12
1985-96 X2 1891 1901 12
1997-2008 Y2 1891-92 1901 12
2009-2020 Z2 1894-5 1901 12
Total 1901 120

Modifications[edit]

The original 36 locomotives had their domes on the firebox, while the domes of the rest were on the middle of the boiler. The two classes became more uniform on rebuilding. All had full-length saddle-tanks; the wheels were 4'0" diameter, the wheelbase was 13'8", and cylinders 15" x 24". They had inside frames. Pannier tanks were fitted from 1910, as rebuilding with Belpaire boilers took place, and from 1924 larger coal bunkers were fitted to many of the class. Seventeen locomotives retained their saddle tanks to the end. These were Nos. 855, 864, 873, 990, 991, 1216, 1904, 1913, 1925, 1932, 1933, 1939, 1944, 1963, 1981, 1984, & 2007.[2]

Use[edit]

The engines were widely spread over the GWR network. They were useful for shunting in dock areas, as at Plymouth, Bristol, Llanelly, and Birkenhead, which was their last stronghold; in 1881-2 four went new to the Cornwall Minerals Railway. In 1906 and 1913 four were sold into industrial service, followed by four more in 1939. Up to 1927 the class were used on empty stock work at Paddington.

British Railways[edit]

One 850 class (no. 992) and 43 former 1901 class locomotives passed into British Railways (BR) ownership in 1948 and were given the power classication "2F". According to Ian Allan, BR called them 1901 class (including no. 992). Ten were painted in BR unlined black, and the last examples survived as late as 1958, the last Armstrong engines in service.[3]

Only three unconverted saddle tanks survived into nationalisation.[4] Of these two were from the 850 class, Nos. 1925 and 2007, which were withdrawn in 1951 and 1949.[5] The other was GWR 2021 Class No. 2048 which was rebuilt as a pannier tank locomotive shortly after nationalisation and scrapped in 1952.[6]

Ian Allan[7] gives the following details for the 1901 class in 1948:

BR numbers, 992 and 1903-2019 (with gaps)
Total, 44 locomotives
Weight, 36 tons 3 cwt (full)
Boiler pressure, 165 psi
Cylinders, 16in x 24in
Driving wheels, 4ft 1.5in
Tractive effort, 17,410 lbf
Route availability, unclassed

References[edit]

  1. ^ probably by le Fleming
  2. ^ le Fleming 1958, pp. E47-E50.
  3. ^ le Fleming 1958, pp. E43-E50.
  4. ^ Casserley, H.C.; Asher, L.L. (1961) [1955]. Locomotives of British Railways. Spring Books. p. 24. 
  5. ^ le Fleming 1958, pp. E48 & E50.
  6. ^ le Fleming 1958, pp. E54.
  7. ^ British Railways Locomotives 1948, part 1, pp 13, 16, 51, Ian Allan, London, 1948

Source[edit]