LNER Class P2
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2001, Cock O' The North
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| Technical parameters: The Engineer. 1 June 1934 p.551 (refer to original design of No.2001) | |||||||||||||||||||||||||||||||||||||||||||||
| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Sir Nigel Gresley |
| Builder | Doncaster Works |
| Build date | 1934-1936 |
| Total produced | 6 |
| Specifications | |
|---|---|
| Configuration | 2-8-2 Mikado |
| Leading dia. | 3 ft 2 in (0.97 m) |
| Driver dia. | 6 ft 2 in (1.88 m) |
| Trailing dia. | 3 ft 8 in (1.12 m) |
| Wheelbase | 37 ft 11 in (11.56 m) engine 16 ft 0 in (4.88 m) tender 64 ft 0.875 in (19.52943 m) total |
| Axle load | 20 long tons (20 t) locomotive approx. |
| Loco weight | 110 long tons 5 cwt (247,000 lb or 112 t) max. |
| Tender weight | 55 long tons 6 cwt (123,900 lb or 56.2 t) max. |
| Firebox: • Firegrate area |
50 sq ft (4.6 m2) |
| Boiler | 6 ft 5 in (1.96 m) max. diameter |
| Boiler pressure | 220 psi (1.5 MPa) |
| Heating surface | 3,349.5 sq ft (311.18 m2) |
| • Tubes | 1,354.2 sq ft (125.81 m2) |
| • Flues | 1,122.8 sq ft (104.31 m2) |
| • Firebox | 237 sq ft (22.0 m2) |
| Superheater: |
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| • Heating area | 635.5 sq ft (59.04 m2) |
| Cylinders | 3 |
| Cylinder size | 21 in × 26 in (530 mm × 660 mm) |
| Valve gear | No. 2001 as built: Lentz rotary cam No. 2001 from April 1938 and nos. 2002–6: Walschaerts outside, Gresley conjugated inside |
| Valve type | No. 2001 as built: Poppet, 8 inch (inlet) and 9 inch (exhaust) No. 2001 from April 1938 and nos. 2002–6: piston valves, 9 inch |
| Performance figures | |
|---|---|
| Tractive effort | 43,462 lbf (193.33 kN) at 85% boiler pressure |
| Career | |
|---|---|
| Operators | London & North Eastern Railway |
| Retired | 1943-1944 |
| Disposition | All rebuilt as LNER Thompson Class A2/2 and later scrapped. One replica and one new-build under construction |
The London and North Eastern Railway Class P2 was a class of 2-8-2 steam locomotives designed by Sir Nigel Gresley for working heavy express trains over the harsh Edinburgh to Aberdeen Line. As they were to serve on Scottish expresses, they were given famous names from Scottish lore.
Six locomotives of the class were built; introduced between 1934 and 1936. Between 1943 and 1944 the class were rebuilt under Gresley's successor Edward Thompson into the LNER Thompson Class A2/2 4-6-2 type.
The locomotives were designed by Nigel Gresley to haul express trains over the difficult Edinburgh to Aberdeen section of the London and North Eastern Railway. In the design Gresley was influenced by recent French practice, in particular passenger locomotives of the Paris à Orléans railway.
The first locomotive of the class, No.2001 Cock o' the North, was introduced in 1934. It was built at Doncaster Works, with Lentz-type rotary-cam actuated poppet valve-gear supplied by the Associated Locomotive Equipment Company, and a double-chimney Kylchap exhaust, each chimney using four nozzle blastpipes. The chimney system was designed to take different fittings to allow experimentation with exhaust arrangements.
The boiler barrel was of the design used on Gresley Pacifics, fitted to a larger firebox. The front end design was of the same form as the Class W1 locomotive, No. 10000, derived from Dr. Dalby's wind tunnel research, and the attached tender was of the standard design used on Gresley Pacifics. The P2 introduced a wedge-shaped cab front end, designed to give a better view forward. The same design was used on the later A4 and V2 express engines. No. 2001 was fitted with a Crosby chime whistle which Gresley had obtained from Captain Howey of the Romney, Hythe and Dymchurch Railway, and which was originally intended for one of that railway's Canadian Pacific style locomotives.
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