GWR 1661 Class

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GWR 1661 Class
Type and origin
Power type Steam
Designer William Dean
Builder GWR Swindon Works
Build date 1886-1887
Total produced 40
 • Whyte 0-6-0ST
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Driver dia. 5 ft 0 in (1.524 m)
Wheelbase 15 ft 9 in (4.80 m)
Frame type Double, plate
Fuel type Coal
Cylinders two
Operators GWR

The 1661 Class was William Dean's second design of tank locomotive for England's Great Western Railway. Like the 1813 Class which preceded them, there were 40 1661s, turned out of Swindon Works in two batches.


  • Nos. 1661-1680 (Lot 69, 1886)
  • Nos. 1681-1700 (Lot 70, 1886-7)


Unlike the 1813s, the 1661s had larger wheels (5 ft 0 in or 1.524 m), double frames with a longer wheelbase (15 ft 9 in or 4.80 m), and saddle, not side tanks. Their frames had originally been ordered for the tender engines of the 2361 Class; however, more 2361s turned out not to be needed, after tank engines (of Joseph Armstrong's 1076 Class) had been found to be successful hauling the heavy coal trains from Aberdare. Like the 2361s, the 1661s carried long boilers (10 ft 6 in or 3.20 m barrel) when new, but shorter boilers were fitted on overhaul. As usual with GWR saddle tanks, pannier tanks were later fitted to most of them, between 1910 and 1926.


In 1904, locomotive No. 1674 was one of two locomotives hauling an express passenger train that was derailed at Loughor, Glamorgan due to excessive speed. Surging of water in the saddle tanks of No. 1674 was considered a contributory factor. Five people were killed and eighteen were injured. Following the accident, eight of the class were sold to South Wales railways in 1906, duly returning into GWR stock at the Grouping in 1922.[1]


The last in service was No. 1685, which ran until 1934. Along with the 1076 class, they were initially used on long distance mineral traffic in the Southern Division of the GWR. To quote le Fleming, "they were always rather misfits", but "...their distinctive features were welcomed by enthusiasts if not by the Running Dept."[2]


  1. ^ Trevena 1981, p. 23.
  2. ^ le Fleming 1958, pp. E60-E63.


  • le Fleming, H. M. (April 1958). White, D.E., ed. Locomotives of the Great Western Railway, part five: Six-coupled Tank Engines. RCTS. 
  • Trevena, Arthur (1981). Trains in Trouble: Vol. 2. Redruth: Atlantic Books. ISBN 0-906899-03-6.