NER Class D

NER Class D LNER Class H1
Power type	Steam
Designer	Vincent Raven
Builder	NER Darlington
Build date	1913,1920—1922
Total produced	45
Configuration	4-4-4T
Gauge	1,435 mm (4 ft 8 1⁄2 in)
Leading wheel diameter	3 ft 1 1⁄4 in (0.946 m)
Driver diameter	5 ft 9 in (1.75 m)
Trailing wheel diameter	3 ft 1 1⁄4 in (0.946 m)
Wheelbase	34 ft 6 in (10.52 m)
Locomotive weight	87.35 long tons (88.75 t)
Fuel type	coal
Fuel capacity	4 long tons (4.1 t)
Water capacity	2,000 imp gal (9,100 l; 2,400 US gal)
Boiler pressure	160 psi (1.1 MPa)
Firegrate area	23 sq ft (2.1 m2)
Heating surface: Tubes	654.24 sq ft (60.781 m2)
Heating surface: Flues	280.6 sq ft (26.07 m2)
Heating surface: Firebox	124 sq ft (11.5 m2)
Heating surface: Total	1,252.974 sq ft (116.4051 m2)
Superheater type	Schmidt
Cylinders	three
Cylinder size	16+1⁄2 × 26 in (420 × 660 mm)
Valve gear	Stephenson
Tractive effort	22,940 lbf (102.0 kN)
Career	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

1. ^ Ahrons, E. L. (1927). The British Steam Railway Locomotive 1825-1925. Amen Corner, London: Locomotive Publishing Co.. pp. 338. 
2. ^ "NER Raven H1 4-4-4T Locomotives". LNER Encyclopedia. http://www.lner.info/locos/H/h1.shtml. 
3. ^ ^{a b} Casserley, H.C.; Asher, L.L. (1961) [1955]. Locomotives of British Railways. Spring Books. pp. 113, 472.