LMS Rebuilt Royal Scot Class

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 type of LMS 2 and 2A boilered 4-6-0 locomotives, after the rebuild of British Legion and the LMS Rebuilt Jubilee Class.

LMS Royal Scot Class
6127 The Old Contemptibles, as rebuilt in 1944
Type and origin
Power typeSteam
DesignerSir William Stanier
RebuilderLMS Derby Works
Rebuild date1943–1955
Number rebuilt70
Specifications
Configuration:
​
 • Whyte4-6-0
 • UIC2′C h3
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.3 ft 3 1⁄2 in (1.003 m)
Driver dia.6 ft 9 in (2.057 m)
Loco weight84.90 long tons (86.26 t; 95.09 short tons)
Tender weightNew: 42.70 long tons (43.39 t; 47.82 short tons)
later: 54.65 long tons (55.53 t; 61.21 short tons)
Water capNew: 3,500 imp gal (16,000 l; 4,200 US gal)
later: 4,000 imp gal (18,000 l; 4,800 US gal)
Tender cap.New: 5.5 long tons (5.6 t; 6.2 short tons)
later: 9 long tons (9.1 t; 10 short tons)
BoilerG10¼S; rebuilt: 2A
Boiler pressure250 psi (1.72 MPa) superheated
CylindersThree
Cylinder size18 in × 26 in (457 mm × 660 mm)
Valve gearWalschaerts
Valve typePiston valves
Performance figures
Tractive effort33,150 lbf (147.46 kN)
Career
Operators
Power class6P; reclassified 7P in 1951
Numbers
  • LMS: 6100–6169
  • BR: 46100–46169
Axle load classBR: Route Availability 9
DispositionTwo preserved; remainder scrapped

LMS gave them the power classification 6P; this was later revised by BR to 7P.

Rebuilding
Year Number rebuilt Numbers[1]
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

1948 Exchange trials
46154 The Hussar during the 1948 exchange trails with an ex-WD tender.

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 the much larger LMS Coronation Class.[2]

Accidents
The aftermath of the Penmaenmawr railway accident in 1950 - 46119 Lancashire Fusilier with accident damage
  • On 27 August 1950, 46119 Lancashire Fusilier was hauling the Irish Mail which was in a rear-end collision with a light engine LMS Hughes Crab No. 42885 at Penmaenmawr, Denbighshire due to a signalman's error. One person was killed.[3]
  • On 21 April 1952, 46117 Welsh Guardsman was one of two hauling an express passenger train which derailed at Blea Moor Loops, West Riding of Yorkshire due to a defect on the other locomotive causing a set of points to move under the train.[4]

Withdrawal
46151 The Royal Horse Guardsman, dumped at Staveley MPD in 1963 - she had been withdrawn the previous year.

All were withdrawn between 1962 and 1965 in accordance with the 1955 Modernisation Plan.

Table of withdrawals
YearQuantity in
service at
start of year		Quantity
withdrawn		Locomotive numbers
1962703046100/02-07/09/13/17/21/23–24/27/30-32/34–35/37/39/45-47/51/53–54/59/61/64
1963401546101/08/11/14/16/19–20/26/33/38/43/49–50/58/69
1964252046110/12/18/22/25/29/36/41–42/44/48/55-57/62–63/65-68
19655446128/40/52/60
19661146115

Preservation

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

References
  1. James, Fred; Hunt, David; Essery, R.J. (1999). LMS Locomotive Profiles, no. 1 - The Rebuilt 'Royal Scots'. Didcot: Wild Swan. p. 55. ISBN 1-874103-49-6.CS1 maint: ref=harv (link)
  2. Tuplin, W.A. (1971). British Steam since 1900. Pan. p. 149. ISBN 0 330 02721 2.
  3. Earnshaw 1989, pp. 32-33.
  4. Earnshaw 1990, p. 30.

Further reading
  • LMS Locomotive Profiles Vol. 1
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