GWR 645 Class

GWR 645 Class
No. 1532 at Croes Newydd Depot, 1947. This was built as a standard saddle-tank in 1879, and acquired its panniers in 1921
Type and origin Power type Steam Designer George Armstrong Builder GWR Wolverhampton Works Build date 1872-1881 Total produced 108
Specifications Configuration: ​  • Whyte 0-6-0ST Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 4 ft 6 in (1.372 m) see text for variations Fuel type Coal Cylinders two Cylinder size 16 in × 24 in (406 mm × 610 mm) see text for variations
Career Operators South Wales Mineral Railway Carmarthen and Cardigan Railway Great Western Railway British Railways Retired 1928-1949 Disposition All scrapped

The GWR 645 Class was a class of 0-6-0ST designed by George Armstrong and built at the Wolverhampton railway works of the Great Western Railway (GWR).^[1] Thirty-six were constructed between 1872-3, of which three were built for the South Wales Mineral Railway (SWMR), two for the Carmarthen and Cardigan Railway (C&CR) and the remainder for the GWR.^[2] In essence, they were saddle tank versions of his GWR 633 Class of 1871.^[1] From 1878, a further 72 of the class, partially enlarged, were added in the 1501 numbering sequence. Unlike the originals, the "1501"s had full-length saddle tanks from the start.