GWR 3700 Class
|3700 Class or City Class|
Nº 3433, City of Bath
|Designer||George Jackson Churchward|
|Builder||GWR Swindon Works|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|3 ft 2 in (0.965 m)|
|Driver diameter||6 ft 8 1⁄2 in (2.045 m)|
|Locomotive weight||55 long tons 6 cwt (123,900 lb or 56.2 t)|
|Locomotive and tender
|92 long tons 1 cwt (206,200 lb or 93.5 t)|
|Cylinder size||18 in × 26 in (457 mm × 660 mm)|
|Top speed||100 mph (160 km/h)|
|Tractive effort||17,800 lbf (79.2 kN)|
|Power class||GWR: A|
|Number in class||20|
|Official name||City Class|
|Axle load class||GWR: Blue|
In September 1902 a member of the Atbara Class, no. 3405 Mauritius, was reboilered with a tapered domeless boiler and Belpaire firebox. The locomotive was the first GWR 4-4-0 to be fitted with a tapered boiler; the boiler became the prototype for Churchward's Standard No. 4 boiler. In March 1903 the first of the City Class, no. 3433 City of Bath, was completed. It was fitted with the final form of the Standard No.4 boiler, with slightly curved sides and a tapered top to the firebox. Another nine locomotives were completed in May 1903. Between February 1907 and December 1908 nine Atbaras were rebuilt with this boiler and incorporated into the City Class. All members of the class were withdrawn between October 1927 and May 1931.
Superheating of the boiler was first applied to no. 3702, Halifax in June 1910. All of the class had been fitted with superheaters by 1912. Boiler feed was originally by clack valves fitted to the underside of the barrel. Top feed was introduced in 1912 and new cast iron chimneys in 1921. The slide valves were replaced by 8 in (20.3 cm) semi-plug piston valves from 1914. All the engines were fitted with steam reversing gear but only a few, including no. 3716 City of London, had the gear replaced by the screw reverse. The Dean suspension bogie was replaced by a bogie developed from the type used on the de Glehn Atlantics.
City of Truro
The most famous locomotive in the class, 3440 City of Truro (later renumbered 3717), is reputedly the first steam locomotive to travel in excess of 100mph, on 9 May 1904.[notes 1] It was the 2000th locomotive to be built at Swindon, leaving the works in April 1903.
Historically significant because of its famed 1904 run, "City of Truro" was a prime candidate for preservation, wheareas the rest of the class were scrapped. It is owned by the National Railway Museum, York. It was last restored to full working order in 2004 and, as of 2009, is frequently loaned for operation on UK main lines and heritage railways.
List of Locomotives
This class were subject to the 1912 renumbering of GWR 4-4-0 locomotives, which saw the Bulldog class gathered together in the series 3300-3455, and other types renumbered out of that series. The City Class took numbers 3700-3719, previously used by Bulldog locomotives.
|3433||3710||City of Bath|
|3434||3711||City of Birmingham|
|3435||3712||City of Bristol|
|3436||3713||City of Chester|
|3437||3714||City of Gloucester|
|3438||3715||City of Hereford|
|3439||3716||City of London|
|3440||3717||City of Truro|
|3441||3718||City of Winchester|
|3442||3719||City of Worcester||City of Exeter|
Bachmann Branchline manufacture a model of City of Truro in OO gauge for sale through the National Railway Museum. In 2014 Bachmann Branchline announced a commemorative World War I Ambulance Train, train pack containing a model of 3711 City of Birmingham.
|Wikimedia Commons has media related to GWR 3700 Class.|
- A US record was twice claimed, although not officially timed, for the inaugural run of the Empire State Express in 1893. A speed of 102 mph, then 112 on the next day, timed as 35 and 32 seconds across a mile, was claimed.
- Casserley, H.C. (1966). Locomotives at the Grouping - No. 4 - Great Western Railway. Ian Allan Limited.
- Fox, Peter (1993). Preserved Locomotives of British Railways. Platform 5 Publishing Limited. ISBN 1-872524-54-0.
- Nock, O.S. (1977). Standard Gauge Great Western 4-4-0s Part 1 Inside Cylinder Classes 1894-1910. Newton Abbot: David & Charles. ISBN 0-7153-7411-7.
- Nock, O.S. (1978). Standard Gauge Great Western 4-4-0s Part 2 Counties to the Close 1904-1961. Newton Abbot: David & Charles. ISBN 0-7153-7684-5.