LNWR Whale Precursor Class

LNWR Precursor Class
LNWR Precursor Class
	No. 513, Precursor in photographic grey livery
Power type
Type and origin
Power type	Steam
Designer	George Whale
Builder	LNWR Crewe Works
Serial number	4415–4419, 4440–4504, 4510–4549, 4660–4679
Build date	1904–1907
Total produced	130
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B n2 or 2′B h2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	6 ft 9 in (2.057 m)
Loco weight	59.15 long tons (60.10 t)
Boiler pressure	175 psi (1.21 MPa)
Cylinders	Two
Cylinder size	19 in × 26 in (483 mm × 660 mm) or 20+1⁄2 in × 26 in (521 mm × 660 mm)
Valve gear	Joy
Tractive effort
Performance figures
Tractive effort	18,222 lbf (81.1 kN) or 20,640 lbf (91.8 kN)
Operators
Career
Operators	London and North Western Railway; → London, Midland and Scottish Railway; → British Railways
Power class	LMS: 2P, 3P
Number in class	1 January 1923: 130; 1 January 1948: 1
Withdrawn	1927–1949
Disposition	All scrapped

The London and North Western Railway (LNWR) "Precursor" Class was a type of 4-4-0 ("American") steam locomotive designed by the company's Chief Mechanical Engineer, George Whale. Introduced in 1904, it should not be confused with the LNWR 2-4-0 "Precursor" Class of 1874 designed by Francis Webb, the last example of which was scrapped in 1895. In 1906, a 4-4-2T ("Atlantic") tank variant of Webb's engine, the "Precursor Tank" Class, also entered service.

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