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]
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
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]