NER Class P1

NER Class P1 LNER Class J25
Power type	Steam
Designer	Wilson Worsdell
Builder	NER Gateshead Works (80) NER Darlington Works (40)
Build date	1898-1902
Total produced	120
Configuration	0-6-0
Gauge	4 ft 8 1⁄2 in (1,435 mm)
Driver diameter	4 ft 7.25 in (1.403 m)
Locomotive weight	39.55 long tons (40.18 t)
Fuel type	coal
Boiler pressure	160 psi (1,100 kPa)
Cylinders	two inside
Cylinder size	18.5 × 26 in (470 × 660 mm)
Tractive effort	21,905 lbf (97,440 N)
Class	NER: P1; LNER: J25
Power class	LNER: 4; GWR: A; BR: 3F
Axle load class	LNER/BR: 3; GWR: Yellow

The NER Class P1 (LNER Class J25) was a class of 0-6-0 steam locomotives of the North Eastern Railway.^[1][2]

Class P1 was a development of Class P, having a boiler four inches longer, and a firebox six inches longer; to accommodate these, the wheelbase was increased by nine inches. The cylinder stroke was also increased by two inches. 120 were built at the North Eastern Railway's locomotive workshops at both Gateshead and Darlington, between 1898 and 1902 in six batches of 20; their numbers were 1961-2000, 2031-80, 2126-42 with the remainder scattered between 25 and 1743. All passed to the LNER in 1923, and their NER numbers were retained, but they were placed in LNER Class J25.^[3]

During World War II, 40 locomotives were loaned to the Great Western Railway. The first transfers to the GWR occurred in October 1939, and the last was not returned to the LNER until December 1946.^[3]

The general LNER renumbering scheme was prepared in 1943, and at that time, 85 locomotives of the J25 class remained: these were allotted 5645-5729, being renumbered during 1946, apart from six which had been withdrawn in the interim. Seventy-six locomotives survived into British Railways ownership in 1948; of these, 64 were given BR numbers, being the 1946 LNER numbers increased by 60000.^[3]

References

1. ^ Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 42
2. ^ http://www.lner.info/locos/J/j25.shtml
3. ^ ^{a b c} Fry, E.V., ed (September 1966). Part 5: Tender Engines - Classes J1 to J37. Locomotives of the L.N.E.R.. Kenilworth: RCTS. pp. 163–4,166–8. ISBN 0 901115 12 6. 

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