Furness Railway 1 class 0-6-0 Furness Railway Class D5 0-6-0
D5 class No. 52509 0-6-0 at Workington Shed, 1951
Type and origin Power type Steam Designer W. F. Pettigrew Builder North British Locomotive Co. (15), Kitson & Co. (4) Build date 1913–20 Total produced 19
Specifications Configuration: ​  • Whyte 0-6-0  • UIC C n2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 4 ft 7+1⁄2 in (1.410 m) Loco weight 1913 batch: 42 long tons 13 cwt (95,500 lb or 43.3 t) Remainder: 44 long tons 17 cwt (100,500 lb or 45.6 t) Boiler pressure 170 lbf (0.76 kN) Cylinders Two Cylinder size 18 in × 26 in (457 mm × 660 mm) Valve gear Stephenson
Performance figures Tractive effort 21,935 lbf (97.57 kN)
Career Operators Furness Railway » London, Midland and Scottish Railway » British Railways Class FR: 1 ("D5") Numbers FR: 1–2; 19–35 LMS: 12494–12512 BR: 52494; 52499; 52501; 52508–52510 Locale London Midland Region Withdrawn 1930–1957 Disposition All scrapped

The Furness Railway 1 class 0-6-0 (classified "D5" by Bob Rush) was a class of nineteen 0-6-0 steam locomotives designed by W. F. Pettigrew and built between 1913 and 1920. Four were built by Kitson and Company and 15 by North British Locomotive Company (NBL). All 19 were assigned London, Midland and Scottish Railway numbers but only six survived long enough to be assigned a British Railways number.

The Class D5 0-6-0 was the final development of the Furness Railway six-coupled goods engine. The class utilised the standardised 4-foot-7+1⁄2-inch (1.410 m) wheels and 18-by-26-inch (457 mm × 660 mm) cylinders of which W. F. Pettigrew had become a great proponent. To gain the extra traction, Pettigrew increased the boiler pressure to 170 lbf/in² (1.17 MPa).^[1] from the 150 lbf/in² (1.03 MPa) of the D3 and 160 lbf/in² (1.10 MPa) of the D4.^[2]

Initially only four were built but, during World War I, a further fifteen were added, all of which had boilers six inches longer than the first four, making them generally more capable but two tonnes heavier.^[1]

The D5 was the largest and most powerful of the mineral engines on the Furness Railway and like many of the 0-6-0 class locomotives on the Furness Railway it was fitted with vacuum brakes and steam heating. This permitted it to be used on excursions and railtours.^[1]

Withdrawals began on 1930 when four, Nos. 12502–03/05–06 were withdrawn. Six survived into BR service, being the only ex-Furness Railway locomotives to survive into BR ownership. The last were withdrawn in 1957 and none of the class were preserved.