Not to be confused with LNWR Webb Precursor Class.
Type of steam locomotive
LNWR Precursor Class
No. 513, Precursor in photographic grey livery
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
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
Performance figures
Tractive effort
18,222 lbf (81.1 kN) or 20,640 lbf (91.8 kN)
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Withdrawn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.[1][2] 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.[3] In 1906, a 4-4-2T ("Atlantic") tank variant of Webb's engine, the "Precursor Tank" Class, also entered service.[4]
^"Four-coupled Passenger Locomotive". The Engineer. Vol. 97. London. 8 April 1904. p. 362 – via Internet Archive.
^"Train Experiments on the London and North-western Railway". The Engineer. Vol. 97. 15 April 1904. p. 387 – via Internet Archive.
^Baxter, Bertram (1979). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2B: London and North Western Railway and its constituent companies. Ashbourne: Moorland Publishing Company. pp. 260–264. ISBN 0903485842.
^"Passenger Tank Engines. No. V". The Engineer. Vol. 110. London. 23 September 1910. pp. 336–337 – via Internet Archive.
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