NER Class D

4 ft 8+1⁄2 in (1,435 mm) standard gaugeLeading dia.3 ft 1+1⁄4 in (0.946 m)Driver dia.5 ft 9 in (1.753 m)Trailing dia.3 ft 1+1⁄4 in (0.946 m)Wheelbase34 ft 6 in (10.52 m)Loco weight87.35 long tons (88.75 t; 97.83 short tons)Fuel typeCoalFuel capacity4 long tons (4.1 t; 4.5 short tons)Water cap.2,000 imp gal (9,100 L; 2,400 US gal)Firebox:​ • Grate area23 sq ft (2.1 m²)Boiler pressure160 psi (1.1 MPa)Heating surface:​ • Firebox124 sq ft (11.5 m²) • Tubes654.24 sq ft (60.781 m²) • Flues280.6 sq ft (26.07 m²) • Total surface1,252.974 sq ft (116.4051 m²)Superheater:
​ • TypeSchmidt • Heating area194.13 sq ft (18.035 m²)CylindersthreeCylinder size16+1⁄2 in × 26 in (419 mm × 660 mm)Valve gearStephenson

Performance figures
Tractive effort	22,940 lbf (102.0 kN)

Career
Operators	North Eastern Railway, London & North Eastern Railway
Retired	1931-1936
Disposition	All rebuilt to LNER Class A8

The North Eastern Railway Class D (later London and North Eastern Railway (LNER) Class H1) was a class of 4-4-4T three-cylinder side tank steam locomotive designed by Vincent Raven in 1913.^[1] They were used for rural passenger services. Forty five were built in total; a first batch of twenty, then a further twenty five after the War.^[2]

Between 1931 and 1936, all of the LNER H1 class were rebuilt with a 4-6-2T wheel layout and re-classified as A8.^[3] They were scrapped between 1957 and 1960.^[3]

References