GWR 3206 Class

The 3206 or Barnum Class consisted of 20 locomotives built at Swindon Works for the Great Western Railway in 1889, and was William Dean's most successful 2-4-0 design. Numbered 3206–3225, they were the last GWR locos built at Swindon with "sandwich" frames (outside frames consisting of timber between two sheets of steel).

GWR 3206 Class
Type and origin Power type Steam Designer William Dean Builder GWR Order number 75 Serial number 1137–1156 Build date 1889 Total produced 20
Specifications Configuration: ​  • Whyte 2-4-0 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 6 ft 1+1⁄2 in (1.867 m) Fuel type Coal Boiler GWR Duke[1] Cylinders Two, inside Cylinder size 18 in × 24 in (457 mm × 610 mm)
Career Operators Great Western Railway Numbers 3206–3225 Disposition All scrapped

Alterations

They underwent various alterations during their working lives, such as thicker tyres giving slightly larger wheels, the gradual adoption of cylinders with a 26 in (660 mm) stroke, and larger diameter boilers of various sorts, as was usual at this period. Between 1910 and 1915, some of the class received taller chimneys resembling those of the Dean Singles.

Use

The Barnums were "express mixed traffic engines" and to start with worked from Swindon to Gloucester and South Wales, and to Weymouth. A few subsequently went to the Northern Division, but in the early 20th century most were at Bristol, Oxford, Swindon and Westbury. By the 1920s they were reduced to branch-line work, apart from a brief spell on the Cambrian main line, and all were withdrawn by early 1937.^[2]