LNWR Webb Precursor Class

The London and North Western Railway (LNWR) Precursor class was a class of forty 2-4-0 steam locomotives designed by F. W. Webb and built at the railway's Crewe Works between 1874 and 1879.

LNWR Precursor class (Webb)
LNWR engine No. 680 'Giffard'
Type and origin
Power typeSteam
DesignerF. W. Webb
BuilderCrewe Works
Serial number1902–1821, 2229–2238, 2249–2258
Build date1874–1879
Total produced40
Specifications
Configuration:
​
 • Whyte2-4-0
 • UIC1B n2
Gauge4 ft 8 1⁄2 in (1,435 mm)
Leading dia.3 ft 6 in (1.067 m)
Driver dia.5 ft 6 in (1.676 m)
Wheelbase
  • 7 ft 5 in (2.261 m) +
  • 8 ft 3 in (2.515 m)
Loco weight32 long tons (33 t)
Boiler:
​
 • Diameter4 ft 2 in (1.27 m)
 • Tube plates9 ft 10 in (3.00 m)
Boiler pressure140 lbf/in2 (0.97 MPa)
Heating surface1,074.6 sq ft (99.83 m2)
Cylinder size17 in × 24 in (432 mm × 610 mm)
Valve gearAllan
Career
OperatorsLondon and North Western Railway
Scrapped1892–1895
DispositionAll scrapped

History

The Precursor class was the locomotive class to be designed wholly by F. W. Webb. He had previously ordered further examples of his predecessor's Samson and Newton classes.

The class featured enclosed wheel splashers and cabs from new, but no brakes were initially fitted; some received steam brakes and others vacuum brakes.

They were fitted with 1,500-imperial-gallon (6,800 l; 1,800 US gal) tenders.

Fleet list

References
  1. Baxter 1979, pp. 185–186.
  • Baxter, Bertram (1979). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2B: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. ISBN 0-903485-84-2.
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