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The GWR 3511 class were standard gauge 2-4-0T locomotives designed by William Dean for the Great Western Railway and built in 1885.

GWR 3511 to 3520
Type and origin Power type Steam Designer William Dean Builder GWR Swindon Order number 64 (part) Serial number 1016–1025 Build date 1885 Total produced 10
Specifications Configuration: ​  • Whyte 2-4-0T  • UIC 1B Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 7 in (1.092 m) Driver dia. 5 ft 1 in (1.549 m) Wheelbase 17 ft 0 in (5.182 m) Fuel type Coal Heating surface 1,209.86 sq ft (112.400 m2)  • Tubes 1,106.57 sq ft (102.804 m2)  • Firebox 103.29 sq ft (9.596 m2) Superheater None Cylinders Two, inside Cylinder size 17 in × 26 in (432 mm × 660 mm) Valve gear Stephenson Train heating Steam
Career Operators GWR

History

They comprised the last ten of the twenty locomotives of Lot 64. The first ten locomotives of this Lot were built to the broad gauge as the 3501 class.

Use

Originally built with condensing apparatus they were used on work through the Severn Tunnel until the ventilation was improved.[1]

Rebuilding

The condensing apparatus was soon removed and in 1894/5 they were all rebuilt as 2-4-0 tender locomotives of the 3201 class as were the 3501 class.

References

• Allcock, N. J.; Davies, F. K.; le Fleming, H. M.; Maskelyne, J. N.; Reed, P. J. T.; Tabor, F. J. (1968) [1951]. White, D. E. (ed.). The Locomotives of the Great Western Railway, part one: Preliminary Survey. Kenilworth: RCTS.
• Tabor, F. J. (August 1959). White, D. E. (ed.). The Locomotives of the Great Western Railway, part six: Four-Coupled Tank Engines. RCTS. ISBN 0-901115-36-3.
• Holcroft, Harold (1957). An Outline of Great Western Locomotive Practice 1837-1947. Shepperton, Surrey, UK: Ian Allan Ltd. ISBN 0-7110-0228-2.

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