| LMS Royal Scot Class | |
| Powertype: | Steam |
| Designer: | Sir William Stanier |
| Rebuilder: | LMS Derby Works |
| Rebuilddate: | 1943–1955 |
| Numberrebuilt: | 70 |
| Whytetype: | 4-6-0 |
| Uicclass: | 2′C h3 |
| Leadingdiameter: | 3feet |
| Driverdiameter: | 6feet |
| Length: | 63feet |
| Locoweight: | 84.9LT |
| Tenderweight: | 54.65LT |
| Watercap: | 4000impgal |
| Tendercap: | 9LT |
| Boiler: | 2A |
| Boilerpressure: | 2502NaN2 superheated |
| Cylindercount: | Three |
| Cylindersize: | 18× |
| Valvegear: | Walschaerts |
| Valvetype: | Piston valves |
| Tractiveeffort: | 331502NaN2 |
| Powerclass: | 6P; reclassified 7P in 1951 |
| Axleloadclass: | BR: Route Availability 9 |
| Disposition: | Two preserved; remainder scrapped |
The London, Midland and Scottish Railway (LMS) Rebuilt Royal Scot Class is a class of 4-6-0 steam locomotives. 70 members of this class were rebuilt by the LMS and its successor British Railways (BR) from LMS Royal Scot Class engines by the replacement of their life expired parallel boilers with a type 2A boiler over the period 1943–1955. (The class sometimes is numbered 71 as it included a prototype 1935 rebuild LMS (4)6170 British Legion, but sufficient technical differences existed which dictate that it is treated separately). They were the second class to be rebuilt with type-2 boilers, after the rebuilding of British Legion and the Jubilee Class.
LMS gave them the power classification 6P; this was later revised by BR to 7P.
| Year | Number rebuilt | Numbers | |
|---|---|---|---|
| 1943 | 9 | 6103/8/9/12/7/24/5/32/46 | |
| 1944 | 9 | 6116/9/20/7/9/31/3/8/45 | |
| 1945 | 11 | 6101/22/6/44/9/50/2/9/60/6/9 | |
| 1946 | 10 | 6104/14/8/21/8/39/47/57/61/8 | |
| 1947 | 3 | 6111/5/35 | |
| 1948 | 4 | 46105/54/62/7 | |
| 1949 | 6 | 46102/6/23/30/43/53 | |
| 1950 | 6 | 46100/7/13/36/41/55 | |
| 1951 | 2 | 46142/64 | |
| 1952 | 3 | 46140/58/65 | |
| 1953 | 4 | 46110/34/51/63 | |
| 1954 | 2 | 46148/56 | |
| 1955 | 1 | 46137 | |
| Total | 70 |
In the 1948 Locomotive Exchange Trials, carried out by the recently nationalised British Railways, involved 46154 The Hussar and 46162 Queens Westminster Rifleman. Apparently a rebuilt 'Royal Scot' proved capable of matching the maximum performance of larger Pacifics.[1]
All were withdrawn between 1962 and 1965 in accordance with the 1955 Modernisation Plan.
| 1962 | 70 | 30 | align=left | 46100/02–07/09/13/17/21/23–24/27/30–32/34–35/37/39/45–47/51/53–54/59/61/64 | |
| 1963 | 40 | 15 | align=left | 46101/08/11/14/16/19–20/26/33/38/43/49–50/58/69 | |
| 1964 | 25 | 20 | align=left | 46110/12/18/22/25/29/36/41–42/44/48/55–57/62–63/65–68 | |
| 1965 | 5 | 4 | align=left | 46128/40/52/60 | |
| 1966 | 1 | 1 | align=left | 46115 |
Of the 70 engines to be rebuilt only 2 members of the class have survived into preservation.
| Number | Name | Builder | Built | Withdrawn | Livery | Location | Owners | Status | Photograph | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| LMS | BR | ||||||||||
| 6100 (former 6152) | 46100 | Royal Scot (former "The King's Dragoon Guardsman") | Derby Works | Jun 1930 (Original engine built Oct 1927) | Oct 1962 | BR Green, Early Emblem | Crewe Diesel TMD | Royal Scot Locomotive and General Trust | Operational, Mainline Certified. | ||
| 6115 | 46115 | Scots Guardsman | North British Locomotive Company | Oct 1927 | Jan 1966 | BR Green, Late Crest | Carnforth MPD | David Smith | Operational, Mainline Certified. Mainline Ticket Expires: 2026 | ||