With Fowler unable to implement his 4-6-2 "Pacific" designs, the LMS design department began to consider the possibility of a 4-6-0 design, a wheel arrangement favoured by the Great Western Railway at the time. At the end of 1926, the LMS requested the loan of one of the GWR's Castle Class locomotives (one of, if not the, most successful GWR designs) in order to run trials against existing LMS designs, and was duly granted the loan of No. 5000 "Launceston Castle".

Technical Data

Introduced : 1927 (in original form)
No. built : 71
Wheel arrangement : 4-6-0



Class 6P "Royal Scot"

The result of the tests was staggering; the Castle outperformed all of the LMS locomotives it faced in the trials, even on the steep Cumbrian banks. It looked like a 4-6-0 could be the answer to the LMS's locomotion problems, and the LMS approached the GWR with a view to either buying Swindon-built Castles for its own use, or obtaining the plans in order to build its own version of the locomotive.

However the GWR did not have the capacity at Swindon for building "export" Castles as well as its own, and was not willing to release the plans of the Castles to the LMS. The LMS then approached the Southern Railway for copies of the plans of its "Lord Nelson" class 4-6-0; the SR were more amenable and released the plans to the LMS. With some modifications at Derby (principally to make a 3-cylinder design, although some elements from Horwich 2-6-0's were also added), the final result was sub-contracted to the North British Locomotive Company, who were asked to produce 50 locomotives in time to implement the "Royal Scot" Express from Euston to Glasgow in 1927. This was the first LMS-built locomotive class to truly embrace the concept of locomotive names; most taking the names of army regiments.

By 1930, the success of the design led the LMS to order another 20 of the class. In 1933, the LMS sent one of the class to the United States on a publicity tour; the engine sent was nominally 6100 "Royal Scot", but was more likely to have been 6152 "The Kings Dragoon Guardsman" with an identity swap (a practice repeated later in the decade with "Princess Coronation" class nos. 6220 & 6229), 6152 having built with improvements suggested by Stanier. However, the identities were not swapped back on return and this should be taken into consideration when considering the 1944 list below, and with regard to the preserved examples (David Jenkinson presents evidence that the identities were not returned in the section "Royal Scot (?) goes to America" of "The Power of the Royal Scots").

The 71st member of the class was not originally a "Royal Scot" as such, but an experimental high pressure compound 4-6-0 initiated by Fowler in 1929, and originally given the name "Fury" and the number 6399. However, during tests, the boiler exploded, causing one fatality, and Fowler abandoned the idea. Stanier eventually had Fury rebuilt as 6170 "British Legion" using a tapered boiler instead of the original parallel boiler; a modification that would be using in the rebuilding of the class which started in the mid-1940's. The rebuilds were prompted by issues that had manifested themselves during the early years of operation, mainly due to problems that meant the engines had difficulty running for more than 6 or 7 hours continuously.

The "Royal Scots" continued to be a mainstay of the LMS fleet, right up until nationalisation; the Stanier "Princesses" were a more powerful locomotive but there were never enough built to do away with the "Royal Scot" class. The rebuilds of the class were completed by 1953, with the scrapping of the class completed by 1965

"Royal Scot" No. 46100 "Royal Scot" arriving at Bewdley, Severn Valley Railway, during the line's 2015 Autumn Gala, 17th September, 2015 


(i) The identities of these two locomotives were switched in 1933 and never switched back.

(ii) Formerly 6399 "Fury", rebuilt by Stanier as the first of the "Rebuilt Scots" in 1935.



Two of the class survived into preservation; 6100 "Royal Scot" and 6115 "Scots Guardsman".    As of October 2017, 6100 is currently operational and main line certified, but 6115 is currently undergoing an overhaul.

6100 was originally preserved in LMS Crimson, although as a rebuild the locomotive never carried this livery in service (the livery was applied during preservation at Bressingham); the locomotive was returned to operational status in BR Green livery as 46100 in 2015 (as seen above).  6115 is currently in BR Green as 46115, although it did carry LMS Postwar Black when initially preserved. 

Number Name (in 1944) Original Name Build Year Built By
 6100(i)  Royal Scot    1927 North British
 6101  Royal Scots Grey    1927 North British
 6102  Black Watch    1927 North British
 6103  Royal Scots Fusilier    1927 North British
 6104  Scottish Borderer    1927 North British
 6105  Cameron Highlander    1927 North British
 6106  Gordon Highlander    1927 North British
 6107  Argyll and Sutherland Highlander    1927 North British
 6108  Seaforth Highlander    1927 North British
 6109  Royal Engineer    1927 North British
 6110  Grenadier Guardsman    1927 North British
 6111  Royal Fusilier    1927 North British
 6112  Sherwood Forester    1927 North British
 6113  Cameronian    1927 North British
 6114  Coldstream Guardsman    1927 North British
 6115  Scots Guardsman    1927 North British
 6116  Irish Guardsman    1927 North British
 6117  Welsh Guardsman    1927 North British
 6118  Royal Welch Fusilier    1927 North British
 6119  Lancashire Fusilier    1927 North British
 6120  Royal Inniskilling Fusilier    1927 North British
 6121  Highland Light Infantry, The City of Glasgow Regiment    1927 North British
 6122  Royal Ulster Riflemen    1927 North British
 6123  Royal Irish Fusilier    1927 North British
 6124  London Scottish    1927 North British
 6125  3rd Carabanier  Lancashire Witch  1927 North British
 6126  Royal Army Service Corps  Sanspareil  1927 North British
 6127  Old Contempibles  Novelty  1927 North British
 6128  The Lovat Scouts  Meteor  1927 North British
 6129  The Scottish Horse  Comet  1927 North British
 6130  The West Yorkshire Regiment  Liverpool   1927 North British
 6131  The Royal Warwickshire Regiment  Planet  1927 North British
 6132  The King's Regiment Liverpool  Phoenix  1927 North British
 6133  The Green Howards  Vulcan  1927 North British
 6134  The Cheshire Regiment  Atlas  1927 North British
 6135  The East Lancashire Regiment  Samson  1927 North British
 6136  The Border Regiment  Goliath  1927 North British
 6137  The Prince of Wales's Volunteers South Lancashire  Vesta  1927 North British
 6138  The London Irish Riflemen  Fury (until 1929)  1927 North British
 6139  The Welch Regiment  Ajax  1927 North British
 6140  The King's Royal Rifle Corps  Hector
North British
 6141  The North Staffordshire Regiment  Caledonian  1927 North British
 6142  The York and Lancaster Regiment  Lion  1927 North British
 6143  The South Staffordshire Regiment  Mail  1927 North British
 6144  Honourable Artillery Company  Ostrich  1927 North British
 6145  The Duke of Wellington's Regt. (West Riding)  Condor  1927 North British
 6146  The Rifle Brigade  Jenny Lind  1927 North British
 6147  The Northamptonshire Regiment  Courier  1927 North British
 6148  The Manchester Regiment  Velocipede  1927 North British
 6149  The Middlesex Regiment  Lady of the Lake  1927 North British
 6150  The Lifeguardsman    1930 Derby
 6151  The Royal Horse Guardsman    1930 Derby
 6152(i)  The King's Dragoon Guardsman    1930 Derby
 6153  The Royal Dragoon    1930 Derby
 6154  The Hussar    1930 Derby
 6155  The Lancer    1930 Derby
 6156  The South Wales Borderer    1930 Derby
 6157  The Royal Artilleryman    1930 Derby
 6158  The Loyal Regiment    1930 Derby
 6159  The Royal Air Force    1930 Derby
 6160  Queen Victoria's Riflemen    1930 Derby
 6161  King's Own    1930 Derby
 6162  Queen's Westminster Riflemen    1930 Derby
 6163  Civil Service Riflemen    1930 Derby
 6164  The Artist's Riflemen    1930 Derby
 6165  The Ranger (12th London Regt.)    1930 Derby
 6166  London Rifle Brigade    1930 Derby
 6167  The Hertfordshire Regiment    1930 Derby
 6168  The Girl Guide    1930 Derby
 6169  The Boy Scout    1930 Derby
 6170 (ii)  The Girl Guide    1930 Derby
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