NER Class Y
No. 9772 at Hull Dairycoates Locomotive Depot 1947
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Wilson Worsdell |
| Builder | Darlington Works |
| Build date | October 1910 – June 1911 |
| Total produced | 20 |
| Specifications | |
|---|---|
| Configuration | 4-6-2T |
| UIC class | 2′C1′ n3t, later 2′C1′ h3t |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 1 1⁄4 in (0.946 m) |
| Coupled dia. | 4 ft 7 1⁄4 in (1.403 m) |
| Trailing dia. | 3 ft 9 1⁄4 in (1.149 m) |
| Wheelbase | 34 ft 3 in (10.439 m) |
| Length | 43 ft 10 in (13.360 m) |
| Axle load | 19.50 long tons (19.81 t; 21.84 short tons) |
| Adhesive weight | 55.50 long tons (56.39 t; 62.16 short tons) |
| Loco weight | 87.50 long tons (88.90 t; 98.00 short tons) |
| Fuel type | Coal |
| Fuel capacity | 5.00 long tons (5.08 t; 5.60 short tons) |
| Water cap | 2,300 imp gal (10,000 l; 2,800 US gal) |
| Boiler pressure | 160 to 180 lbf/in2 (1.1 to 1.2 MPa) |
| Cylinders | Three |
| Cylinder size | 16 1⁄2 in × 26 in (419 mm × 660 mm) |
| Valve gear | Stephenson |
| Valve type | 7 1⁄2-inch (191 mm) piston valves |
| Performance figures | |
|---|---|
| Tractive effort | 26,140 to 29,405 lbf (116.28 to 130.80 kN) |
| Career | |
|---|---|
| Operators | |
| Power class | BR: 5F, 3F from May 1953 |
| Axle load class | LNER/BR: Route availability: 7 |
| Disposition | All scrapped |
The North Eastern Railway (NER) Class Y (LNER Class A7) 4-6-2T tank locomotives were designed whilst Wilson Worsdell was Chief Mechanical Engineer, but none were built until 1910 by which time Vincent Raven had taken over.
The Class Y locomotives were intended for hauling coal trains and were developed from the NER Class X (LNER Class T1) 4-8-0T heavy shunters. However, they had larger boilers and smaller cylinders for higher working speeds. Twenty were built in one batch and numbered between 1113 and 1195. Originally built with saturated boilers pressed to 175 lbf/in2 (1.21 MPa), seven locomotives were later fitted with boilers equipped with superheaters and pressed to 160 lbf/in2 (1.10 MPa).
All twenty locomotives passed to the London and North Eastern Railway at the 1923 Grouping. The LNER left the NER's locomotive numbers unchanged, but raised the boiler pressure of the saturated locomotives to 180 lbf/in2 (1.2 MPa). They also fitted ten more locomotives with the 160 lbf/in2 superheated boilers that the LNER classified as diagram 55.
By the time the A7s entered LNER ownership in 1923, the A7s had been relegated to shunting in the larger marshalling yards. Their power was invaluable when shunting heavy trains over the shunting hump. In the 1930s, Nos. 1136 and 1175 were allocated to hauling chalk quarry trains from Hessle Quarry to Stoneferry Cement Works, in the Hull area.
Heavy mineral traffic declined after the end of World War II, and the A7s moved to the Hull area, except for Nos. 1181 and 1192 which stayed at . At Hull, the A7s replaced the old Hull and Barnsley Railway (H&BR) types which were being withdrawn at that time.
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