LNWR Samson Class

The LNWR Samson Class was a class of ninety 2-4-0 steam locomotives[1] built by the London and North Western Railway at their Crewe Works between 1863 and 1879.

LNWR Samson Class
2154 Loadstone at Monument Lane locomotive depot
Type and origin
Power typeSteam
DesignerJohn Ramsbottom
BuilderCrewe Works
Serial number624–633, 680–689, 730–739, 780–789, 880–889, 1692–1701, 1842–1861, 2279–2288
Build dateMay 1863 – May 1879
Total produced90
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.6 ft 3 in (1.905 m)
Wheelbase:
 • Engine		14 ft 7 in (4.445 m)
 • Leading7 ft 5 in (2.261 m)
 • Coupled7 ft 2 in (2.184 m)
Loco weight26 long tons 2 cwt (26.5 t)
Water cap1,500 imp gal (6,800 l; 1,800 US gal)
Boiler:
​
 • Diameter3 ft 9 1⁄8 in (1.146 m)
 • Tube plates9 ft 8 3⁄8 in (2.956 m)
Boiler pressure140 lbf/in2 (970 kPa; 9.8 kgf/cm2)
Heating surface1,083 sq ft (100.6 m2)
CylindersTwo, inside
Cylinder size16 in × 20 in (406 mm × 508 mm)
Valve gearStephenson
Performance figures
Tractive effort8,700 lbf (38.70 kN)
Career
OperatorsLondon and North Western Railway
Withdrawn1889–1925
DispositionAll scrapped

They were officially designated Curved Link 6-ft Passenger due to the use of a curved link between the fore and back eccentric rods of their Stephenson valve gear and the use of 6-foot (1.829 m) diameter wheel centres, which, together with 1 1⁄2-inch (38 mm) thick tyres gave a driving wheel diameter of 6 feet 3 inches (1.905 m).[2]

Ostensibly a mixed traffic design, they were the first locomotives with coupled driving wheels to be allocated for passenger duties on the LNWR.

They were designed by John Ramsbottom who had fifty built, all without cabs and with pierced driving wheel splashers. Ramsbottom's successor F. W. Webb, built forty more, all with cabs. The earlier locomotives also gained cabs, and all eventually had their splashers filled in.

All ninety locomotives were 'renewed' (replaced) by a like number of Waterloo class locomotives between 1889 and 1905, but only eighty were scrapped quickly. The ten exceptions were transferred to the Civil Engineer's list, and these were withdrawn between 1914 and 1925.[3]

None were preserved.

References
  1. http://www.lnwrs.org.uk/PassClassLocos/pass_class_menu.php?display_class_details=rsam
  2. Baxter 1978, p. 118.
  3. Baxter 1978, pp. 118–120.
  • Baxter, Bertram (1978). Baxter, David (ed.). British Locomotive Catalogue 1825–1923, Volume 2A: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. ISBN 0-903485-51-6.
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