NER Class D

This article is about the 4-4-4T class. For the 2-4-0 class, see NER Class F.

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]

NER Class D LNER Class H1
Type and origin Power type Steam Designer Vincent Raven Builder NER Darlington Build date 1913, 1920—1922 Total produced 45
Specifications Configuration: ​  • Whyte 4-4-4T Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading 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) Wheelbase 34 ft 6 in (10.52 m) Loco weight 87.35 long tons (88.75 t; 97.83 short tons) Fuel type Coal Fuel capacity 4 long tons (4.1 t; 4.5 short tons) Water cap. 2,000 imp gal (9,100 L; 2,400 US gal) Firebox: ​  • Grate area 23 sq ft (2.1 m2) Boiler pressure 160 psi (1.1 MPa) Heating surface: ​  • Firebox 124 sq ft (11.5 m2)  • Tubes 654.24 sq ft (60.781 m2)  • Flues 280.6 sq ft (26.07 m2)  • Total surface 1,252.974 sq ft (116.4051 m2) Superheater: ​  • Type Schmidt  • Heating area 194.13 sq ft (18.035 m2) Cylinders three Cylinder size 16+1⁄2 in × 26 in (419 mm × 660 mm) Valve gear Stephenson
Performance figures Tractive effort 22,940 lbf (102.0 kN)
Career Operators North Eastern Railway, London and North Eastern Railway Retired 1931-1936 Disposition All rebuilt to LNER Class A8

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]