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LMS Royal Scot Class: Wikis


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LMS Royal Scot Class
Parallel boilered 6100 Royal Scot poses for the official photograph after preparation for its North American tour, 1933.
Power type steam
Designer Sir Henry Fowler
rebuilt: Sir William Stanier
Builder North British Locomotive Company (6100–6149)
London Midland & Scottish Railway, Derby works (6150–6169)
Serial number 23595–23644 (6100–6149)
Build date 1927, 1930
Total production 70
Configuration 4-6-0
Gauge 4 ft 8+12 in (1,435 mm)
Leading wheel diameter 3 ft 3½ in
Wheel diameter 6 ft 9 in
Weight 84 tons 18 cwt
Boiler G10¼S; rebuilt: 2A
Boiler pressure 250 psi superheated
Cylinders 3
Cylinder size 18 in bore × 26 in stroke
Valve gear Walschaert (piston valves)
Tractive effort 33,150 lbf
Class 6P; reclassified 7P in 1951

The London, Midland and Scottish Railway (LMS) Royal Scot Class is a class of 4-6-0 express passenger locomotive introduced in 1927. Originally having parallel boilers, all members were later rebuilt with tapered type 2A boilers, and were in effect two classes.



By the mid-1920s the LMS had followed the Midland Railway's small engine policy that meant that it had no locomotives of sufficient power for its expresses on the West Coast Main Line. Trains were entrusted to LMS/MR Midland Compounds 4-4-0s, the LNWR Claughton Class and the L&YR Dreadnought 4-6-0s. Construction of 50 of a new class of 4-6-0 was authorised from the North British Locomotive Works in Glasgow, and they were introduced without testing, the design being based on the SR Lord Nelson Class; although Radford claims that the boiler owed much to the MR 0-10-0 Lickey Banker 'Big Bertha'. A further 20 were built by Derby Works.

They were initially named after Regiments and some after historical LNWR locomotives, though those were renamed in 1935/6 to take more names of regiments.

From late 1931, after several bizarre forms were tried on various locomotives, the straight sided Smoke deflectors were added to stop drifting smoke; these were later replaced by angled-top items. From 1933 the class were taken off the top-link expresses, being superseded by the LMS Princess Royal Class and later the LMS Princess Coronation Class pacifics.

North American Tour

In 1933 one locomotive was sent to North America on a tour, 6152 swapping identities with 6100 The Royal Scot, the identities never being swapped back after its return.


LMS 6399 Fury of 1929 was an unsuccessful experimental prototype locomotive, with a high-pressure, water tube boiler and compound 3 cylinder drive, based on the Royal Scot. It was rebuilt by William Stanier in 1935 with a Type 2 conventional boiler to become 6170 British Legion. This served as the blueprint for later rebuilding, but always remained a one-off.


In 1942 the LMS rebuilt two LMS Jubilee Class locomotives with Type 2A boilers, but later turned to the parallel-boilered Royal Scots whose boilers and cylinders were life-expired, and whose smokeboxes were difficult to keep airtight. Most of these however turned out to be paper rebuilds – in effect new locomotives but rebuilding was more easily justified in the eyes of accountants and of the wartime government. Initially these too were built without smoke deflectors but later acquired them.


All were withdrawn between 1962 and 1965.

The class title of Royal Scot was subsequently re-used in 1976 as an official name for the then-new Class 87s but it never stuck, partly out of respect for the original fleet.


Note: Built below refers to the 'LMS build date'.


Two have been preserved. These are (4)6100 Royal Scot and (4)6115 Scots Guardsman. No. 6100 Royal Scot is owned by Bressingham Steam Museum in Norfolk, and returned to steam for first time in over 20 years at the West Somerset Railway's 2009 spring gala.

In fiction

This class forms the basis for the Big City Engine in The Railway Series. No. 6115 Scots Guardsman featured in the 1936 film Night Mail.


Mainline produced No. 6100 Royal Scot as a 00 model. Bachmann took over the tooling for the locomotive, and did do a short production run, the ultimate intention of re-tooling the design to upgrade it to moden standards and detailing, but unfortunately Hornby beat them to it.

Hornby produced their own Rebuilt Scots, these being introduced in 2007, along with the rebuilt patriot locomotives. Rivarossi (now part of Hornby) made a similar model of the No. 6100 in an intermediate approx. 1:80 (3.8mm/ft) between HO & OO in 1977 based on the original unrebuilt form in LMS livery. It also made another model of the No. 6140 "Hector" sister engine.

Graham Farish released a 'N' gauge model in 2009, in LMS Black, and BR Brunswick Green liveries.

Brassmasters did a limited edition kit in 4mm.



  • David Jenkinson, The Power of the Royal Scots – OPC. (coffee table photo book).
  • O. S. Nock Royal Scots and Patriots of the LMS
  • Radford, Derby Works and Midland Locomotives, – Ian Allan, 1971
  • The Book of the Royal Scots – Irwell Press ISBN 1-871608-99-6
  • On the Trail of the Royal ScotThe History Press ISBN 9780750946254

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