LSWR 700 class

The LSWR 700 class was a class of 30 0-6-0 steam locomotives designed for freight work. The class was designed by Dugald Drummond in 1897 for the London and South Western Railway in England and built by Dübs and Company at that company's Queen's Park works at Polmadie, Glasgow, Scotland.

LSWR 700 class
No. 30355 on Feltham locomotive depot, May 1959
Type and origin
Power typeSteam
DesignerDugald Drummond
BuilderDübs & Co.
Serial number3510–3538
Build dateMarch–June 1897
Specifications
Configuration:
​
 • Whyte0-6-0
 • UICC n2
Driver dia.61 in (1.549 m)
Loco weight42.75 long tons (43.44 t)
Tender cap.coal: 4 long tons (4.1 t);
water: 3,500 imp gal (16,000 l)
Firebox:
 • Firegrate area		20.25 sq ft (1.881 m2)
Boiler pressure175 psi (1.21 MPa)
Heating surface:
 • Tubes		1,068 sq ft (99.2 m2)
 • Firebox124 sq ft (11.5 m2)
Cylinder size18 1⁄2 in × 26 in (470 mm × 660 mm)
Performance figures
Tractive effort22,487 lbf (100.03 kN)
Career
Power classLSWR / SR: C
Number in class30
NicknamesBlack Motor
DispositionAll rebuilt with superheaters
LSWR 700 class (after superheating)
Type and origin
Only details that changed are shown here
Power typeSteam
Specifications
Configuration:
​
 • UICC h2
Loco weight46.70 long tons (47.45 t)
Boiler pressure180 psi (1.24 MPa)
Heating surface:
 • Tubes		860 sq ft (80 m2)
 • Firebox117 sq ft (10.9 m2)
Superheater:
​
 • TypeEastleigh (11); later all Maunsell
 • Heating areaEastleigh: 167 sq ft (15.5 m2); Maunsell 182 sq ft (16.9 m2)
Cylinder size19×26 
(483×660 mm)
Performance figures
Tractive effort23,500 lbf (105 kN)
Career
Power classLSWR / SR: C
BR: 4F, later 3F
DispositionAll scrapped

Overview

The class was originally numbered 687–716 but the year after delivery numbers 702–716 were given new numbers vacated by engines that had been withdrawn. The locomotives gained the nickname 'Black Motor' early in their career. They were well designed and had few major modifications during the existence of the fleet – the exception being fitted with superheaters from 1919 to 1929, which required the fitting of an extended smokebox. They shared many standard parts with Drummond's other designs (including sharing boilers with the M7 class).

Construction and numbering
Year Builder Quantity LSWR numbers
1897 Dübs & Co. 3510–3539
30
687–716

Nos. 702–716 were renumbered by the LSWR between June and August 1898, becoming 306, 308, 309, 315, 317, 325–327, 339, 346, 350, 352, 355, 368, 459 respectively. In June 1912, no. 459 was renumbered again, to 316.[1]

Soon after the locomotives passed to Southern Railway (SR) ownership, their LSWR numbers were prefixed "E" to denote Eastleigh Works - this was done to distinguish similarly-numbered locomotives from the other constituents of the SR; thus, LSWR no. 687 became SR no. E687. These prefixes were dropped from mid-1931.[2] In the meantime, there had been a proposal (prepared in March 1927) to renumber some classes into continuous blocks: the 700 class were allocated the series E336–9, E369–379 and E686–701 but none were actually renumbered, and the plan was cancelled in December 1927.[3]

Ownership changes
700 class No. 30700 at Guildford Station, April 1958

The 700s remained intact as a class through SR ownership from 1923 to 1947. The locomotives passed to British Railways (BR) in 1948 and BR increased the former LSWR/SR numbers by 30000.

Accidents and incidents

Withdrawal

The first to be withdrawn was No. 30688 in September 1957, with the second, No. 30352, following in June 1959 and then the 3rd, No. 30687, in September 1960. The final seven were all withdrawn by British Railways in December 1962.

Table of withdrawals
YearQuantity in
service at
start of year		Quantity
withdrawn		Locomotive numbersNotes
195730130688
1958290–
195929130352
196028130687
1961271030308/17/27/55, 30691/93–94/96/99, 30701
1962171730306/09/15–16/25–26/39/46/50/68, 30689–90/92/95/97–98, 30700

Preservation

None were saved for preservation.

Models

Hornby produce models of the 700 class in both Southern Railway livery and British Railway livery[5] including an example of the engine in the Return from Dunkirk train pack.

Notes
  1. Bradley 1967, p. 100.
  2. Bradley 1965, pp. 17–18.
  3. Bradley 1967, p. 210.
  4. Earnshaw, Alan (1990). Trains in Trouble: Vol. 6. Penryn: Atlantic Books. p. 34. ISBN 0-906899-37-0.
  5. http://www.hornbymagazine.com/2015/07/10/film-hornby-drummond-700/

References
  • Bradley, D.L. (1965). Locomotives of the L.S.W.R.: Part 1. Kenilworth: RCTS.CS1 maint: ref=harv (link)
  • Bradley, D.L. (1967). Locomotives of the L.S.W.R.: Part 2. Kenilworth: RCTS.CS1 maint: ref=harv (link)
  • Haresnape, Brian; Rowledge, Peter (October 1982). Drummond Locomotives, A Pictorial History. Shepperton, Surrey, UK: Ian Allan Ltd. ISBN 0-7110-1206-7. DX/1082.CS1 maint: ref=harv (link)
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