LNWR Precursor Tank Class

LNWR Precursor Tank

Type and origin
Power type	Steam
Designer	George Whale
Build date	1906–1909
Total produced	50

Specifications
Configuration	4-4-2T
UIC class	2′B1 2t
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	First 30: 3 ft 9 in (1.143 m) Last 20: 3 ft 3 in (0.991 m)
Driver dia.	6 ft 3 in (1.905 m)
Trailing dia.	First 30: 3 ft 9 in (1.143 m) Last 20: 3 ft 3 in (0.991 m)
Loco weight	74 long tons 15 cwt (167,400 lb or 75.9 t)
Boiler pressure	175 psi (1.21 MPa)
Cylinders	Two, inside
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Valve gear	Joy

Performance figures
Tractive effort	15,216 lbf (67.68 kN)

Career
Operators	LNWR » LMS
Power class	LMS: 2P
Withdrawn	1927–1940
Disposition	All scrapped

The London and North Western Railway (LNWR) Precursor Tank Class was a class of 4-4-2 tank steam locomotives. Fifty were built to the design of George Whale between 1906 and 1909, being a tank engine version of his Precursor Class.

The first thirty had 3 ft 9 in (1.143 m) carrying wheels, the latter twenty had 3 ft 3 in (0.991 m) carrying wheels. The LNWR reused numbers from withdrawn locomotives, so the numbering system was completely haphazard. The 3 ft 9 in engines were numbered by 528, 531, 784, 1295, 1305, 1981–1985, 97, 111, 181, 196, 562, 616, 803, 1356, 1508, 2210, 139, 653, 834, 874, 1506, 1572, 1589, 1671, 1714, and 2165. The 3 ft 3 in engines were numbered 44, 527, 612, 762, 827, 875, 1427, 1764, 2196, 2446, 920, 935, 1164, 1219, 1523, 1536, 1551, 2077, 2223 and 2228.

All fifty passed into LMS ownership in 1923. The LMS gave them the power classification 2P. The LMS also renumbered them into solid block of numbers: 6780–6809 for the 3 ft 9 in engines and 6810–6829 for the 3 ft 3 in engines, in the order given above.

They were withdrawn between 1927 and 1940. None were preserved.

References

Casserley, H. C. & Johnston, Stuart W. (1974) [1966]. Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 77. ISBN 0-7110-0554-0.

Wikimedia Commons has media related to LNWR Precursor Tank class.

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