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Specifications
Specifications
Configuration:;
• Whyte	4-6-0
• UIC	2′C h3
Gauge	4 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)
Length	63 ft 0+1⁄2 in (19.22 m)
Loco weight	84.90 long tons (86.26 t; 95.09 short tons)
Tender weight	54.65 long tons (55.53 t; 61.21 short tons)
Water cap.	4,000 imp gal (18,000 L; 4,800 US gal)
Tender cap.	9 long tons (9.1 t; 10 short tons)
Boiler	2A
Boiler pressure	250 psi (1.72 MPa) superheated
Cylinders	Three
Cylinder size	18 in × 26 in (457 mm × 660 mm)
Valve gear	Walschaerts
Valve type	Piston valves

Type and origin
Type and origin
Power type	Steam
Designer	Sir William Stanier
Rebuilder	LMS Derby Works
Rebuild date	1943–1955
Number rebuilt	70

LMS Royal Scot Class
LMS Royal Scot Class
	6127 The Old Contemptibles, as rebuilt in 1944
Power type
Type and origin
Power type	Steam
Designer	Sir William Stanier
Rebuilder	LMS Derby Works
Rebuild date	1943–1955
Number rebuilt	70
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-0
• UIC	2′C h3
Gauge	4 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)
Length	63 ft 0+1⁄2 in (19.22 m)
Loco weight	84.90 long tons (86.26 t; 95.09 short tons)
Tender weight	54.65 long tons (55.53 t; 61.21 short tons)
Water cap.	4,000 imp gal (18,000 L; 4,800 US gal)
Tender cap.	9 long tons (9.1 t; 10 short tons)
Boiler	2A
Boiler pressure	250 psi (1.72 MPa) superheated
Cylinders	Three
Cylinder size	18 in × 26 in (457 mm × 660 mm)
Valve gear	Walschaerts
Valve type	Piston valves
Tractive effort
Performance figures
Tractive effort	33,150 lbf (147.46 kN)
Operators
Career
Operators	London, Midland and Scottish Railway; → British Railways;
Power class	6P; reclassified 7P in 1951
Numbers	LMS: 6100–6169; BR: 46100–46169;
Axle load class	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.

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

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.^[2]

Accidents

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. Six people died as a result of the crash.^[3]^[4]
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.^[5]^{[full citation needed]}

Withdrawal

All were withdrawn between 1962 and 1965 in accordance with the 1955 Modernisation Plan.

Table of withdrawals
Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers
1962	70	30	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	46101/08/11/14/16/19–20/26/33/38/43/49–50/58/69
1964	25	20	46110/12/18/22/25/29/36/41–42/44/48/55–57/62–63/65–68
1965	5	4	46128/40/52/60
1966	1	1	46115

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	Name	Builder	Built	Withdrawn	Livery	Location	Owners	Status	Photograph
6100 (former 6152)^[6]^[7]	46100	Royal Scot (former "The King's Dragoon Guardsman")	Derby Works	Jun 1930 (Original engine built Oct 1927)^[6]^[7]	Oct 1962	BR Green, Early Emblem	Crewe Diesel TMD	Royal Scot Locomotive and General Trust	Operational, Mainline Certified.^{[citation needed]}
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

^ James, Hunt & Essery 1999, p. 55.
^ Tuplin, W.A. (1971). British Steam since 1900. Pan. p. 149. ISBN 0-330-02721-2.
^ "Report on the Collision that occurred on the 27th August 1950 at Penmaenmawr in the London Midland Region British Railways :: The Railways Archive".
^ Earnshaw 1989, pp. 32–33.
^ Earnshaw 1990, p. 30.
^ ^a ^b Goodman 1994, pp. 80, 83.
^ ^a ^b James, Hunt & Essery 1999, pp. 41, 54.

Earnshaw, Alan (1989). Trains in Trouble: Vol. 5. Penryn: Atlantic Books. ISBN 0-906899-35-4.
Earnshaw, Alan (1990). Trains in Trouble: Vol. 6. Penryn: Atlantic Books. ISBN 0-906899-37-0.
Goodman, John (1994). Greenwood, William (ed.). LMS Locomotive Names. Lincoln: RCTS. ISBN 0-901115-79-7.
James, Fred; Hunt, David; Essery, R.J. (1999). LMS Locomotive Profiles, no. 1 - The Rebuilt 'Royal Scots'. Didcot: Wild Swan. ISBN 1-874103-49-6.