Furness Railway 115 class

The Furness Railway 115 class (unofficially classified N1 by Bob Rush), was a class of five 4-6-4 (or Baltic) tank locomotives of the Furness Railway. They were designed by David Rutherford^[1] and built by Kitson and Company in 1920–1921. They were nicknamed "Jumbos" and the author Bob Rush gave them the unofficial classification N1. Their main duty was to haul express passenger trains between Carnforth and Whitehaven.^[2]

Power typeSteam

Power typeSteam

DesignerDavid Rutherford

BuilderKitson and Company

Quick facts Type and origin, Power type ...

Furness Railway 115 class
FR 115 class
Type and origin Power type Steam Designer David Rutherford Builder Kitson and Company Serial number 5292–5296 Build date 1920-1921 Total produced 5
Specifications Configuration: ​  • Whyte 4-6-4T  • UIC 2′C2′ n2t Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 5 ft 8 in (1.727 m) Trailing dia. 3 ft 2 in (0.965 m) Wheelbase 40 ft 9 in (12.421 m) Height 13 ft 6 in (4.115 m) Loco weight 92.75 long tons (94.24 t) Fuel type Coal Water cap. 2,800 imp gal (13,000 L; 3,400 US gal) Boiler pressure 170 psi (1.17 MPa) Cylinders Two, inside Cylinder size 19+1⁄2 in × 26 in (495 mm × 660 mm) Valve gear Stephenson
Performance figures Tractive effort 21,006 lbf (93.44 kN)
Career Operators Furness Railway → London, Midland and Scottish Railway Class FR: 115 Power class LMS: 3P Numbers FR: 115-119 LMS: 11100–11104 Withdrawn 1934–1935, 1940 Disposition All scrapped

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They were the only Baltic tank locomotives in Britain with inside cylinders, and one of two to lack a superheater.^[3]