The Furness Railway 120 class (classified K1 by Bob Rush)^[1] or "Seagulls", were a class of four 4-4-0 steam locomotives designed by W. F. Pettigrew and built by Sharp, Stewart and Company of Glasgow for the Furness Railway in 1890.

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Furness Railway 120 class
Type and origin Power type Steam Designer W. F. Pettigrew Builder Sharp, Stewart and Company Serial number 3618–3621 Build date 1890 Total produced 4
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B n2S Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 5 ft 7+1⁄2 in (1.715 m) Loco weight 36 long tons 2 cwt (80,900 lb or 36.7 t) Fuel capacity Coal Boiler pressure 140 lbf/in2 (965 kPa) Cylinders Two Cylinder size 17 in × 24 in (432 mm × 610 mm) Valve gear Stephenson
Performance figures Tractive effort 12,228 lbf (54.39 kN)
Career Operators FR » LMS Class 120 ("K1") Numbers FR: 120–123 LMS: 10131–10134 Nicknames Seagulls Withdrawn 1924–1927 Disposition All scrapped

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They all passed to the London, Midland and Scottish Railway at the 1923 grouping.

They were withdrawn between 1924 and 1927.

• Locomotives of the Furness Railway