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Specifications
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

Type and origin
Type and origin
Power type	Steam
Designer	George Armstrong
Builder	GWR Wolverhampton Works
Build date	1872-1881
Total produced	108

GWR 645 and 1501 Classes
GWR 645 and 1501 Classes
	No. 1532 at Croes Newydd Depot, 1947. This was built as a standard saddle-tank in 1879, and acquired its panniers in 1921
Power type
Type and origin
Power type	Steam
Designer	George Armstrong
Builder	GWR Wolverhampton Works
Build date	1872-1881
Total produced	108
Configuration:;
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
Operators
Career
Operators	South Wales Mineral Railway; Carmarthen and Cardigan Railway; Great Western Railway; British Railways
Retired	1928-1949
Disposition	All scrapped

The GWR 645 and 1501 Classes were two closely-related classes of 0-6-0 ST designed by George Armstrong and built at the Wolverhampton railway works of the Great Western Railway (GWR).^[1] Thirty-six, the 645 Class, 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, the 1501 Class, partially enlarged, were added. Unlike the originals, these had full-length saddle tanks from the start.

Construction

The whole class was delivered in nine lots, as follows:

645-655, plus one (Lot O, 1872)
656, 757-763, plus four (Lot P, 1872-3)
764-775 (Lot Q, 1873)
1501-1512 (Lot A2, 1878)
1513-1524 (Lot B2, 1878-9)
1525-1536 (Lot D2, 1879)
1537-1548 (Lot E2, 1879–80)
1549-60 (Lot F2, 1880)
1801-1812 (Lot G2, 1881)

Three of the un-numbered engines plus No. 767 were sold to the SWMR, and the other two plus No. 655 to the C&CR. The latter three returned to the GWR in 1881, becoming Nos. 902-904.

Dimensions

When built, they had 4 ft 6 in (1.372 m) driving wheels (later 4 ft 7+1⁄2 in or 1.410 m due to thicker tyres). The principal visual differences between the two classes were that the 645 class had short tanks and no cabs, whereas the 1501 class had cabs and full-length tanks. Other differences included:

645 Class: saddle tanks only cover the boiler and firebox; cab has only a front weatherboard and low side sheets; rear end of frames 5 ft 3 in (1.60 m) from rear axle; cylinder bore 16 in (410 mm); heating surface 1,300 sq ft (120.8 m²); tank capacity 980 imp gal (4,500 L). Half-cabs were added a few years after construction.

1501 Class: saddle tanks are full-length, and cover the smokebox; cab has roof and full-height side sheets; rear end of frames 5 ft 9 in (1.75 m) from rear axle; cylinder bore 17 in (430 mm); heating surface 1,145 sq ft (106.4 m²); tank capacity 1,120 imp gal (5,100 L).

From 1918 all but eight of the class were rebuilt with Belpaire fireboxes and larger, pannier tanks extending over the smokebox, and the 17 in (432 mm) diameter cylinders became standard.

Use

Most of the 645s and 1501s were allocated to the Northern Division of the GWR. Between 1910 and 1922 three more of them, Nos. 1806, 1811 and 1546, were transferred to the SWMR, and others too went to South Wales. Most were withdrawn in 1930s. Nos. 1531, 1532, 1538 and 1542 passed briefly into British Railways ownership, but all were withdrawn by December 1949. None have survived into preservation.

References

^ ^a ^b Holcroft 1971, p. 36.
^ le Fleming 1958, pp. E35–E40.

Holcroft, Harold (1971) [1957]. An Outline of Great Western Locomotive Practice 1837-1947. Shepperton: Ian Allan. ISBN 0-7110-0228-2.
le Fleming, H. M. (April 1958). White, D. E. (ed.). The Locomotives of the Great Western Railway, part five: Six-coupled Tank Engines. RCTS. ISBN 0-901115-35-5. OCLC 500544510.