LSWR L11 class

LSWR/SR L11 [1]

L11 408 with the original watertube firebox, ca. 1907
Type and origin
Power type Steam
Designer Dugald Drummond
Builder LSWR Nine Elms Works
Build date 1903
Total produced 40
Specifications
Configuration:
 ​
 • Whyte 4-4-0
Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia. 3 ft 7 in (1.092 m)
Driver dia. 5 ft 7 in (1.702 m)
Loco weight 50 long tons 11 cwt (113,200 lb or 51.4 t)
Fuel type Coal
Fuel capacity 4 long tons 0 cwt (9,000 lb or 4.1 t)
Water cap 3,500 imp gal (16,000 L; 4,200 US gal)
Boiler pressure 175 psi (1.21 MPa)
Cylinders Two, inside
Cylinder size 18 1⁄2 in × 26 in (470 mm × 660 mm)
Valve gear Stephenson
Performance figures
Tractive effort 19,796 lbf (88.06 kN)
Career
Operators London and South Western Railway, Southern Railway, Southern Region of British Railways
Class LSWR / SR: L11
BR: 1MT
Nicknames Large Hopper
Locale Great Britain
Retired 1949–1952
Disposition All scrapped

The London and South Western Railway L11 class was a class of 4-4-0 steam locomotives designed for mixed traffic work. They were introduced in 1903 and were nicknamed "Large Hoppers". As with most other Drummond productions, the locomotive had two inside cylinders and Stephenson link valve gear.

Background

The L11 class was one of a number of designs by Dugald Drummond incorporating a large proportion of standard parts that could be interchanged with other classes of locomotive. The boiler was interchangeable with the T9 class, and likewise was equipped with water tubes fitted across the firebox combustion space, with the aim of increasing heating surface whilst facilitating water circulation; this device however also increased maintenance costs and was soon removed by Drummond's successor, Robert Urie.

Later history

The L11 class was never equipped with a superheater as was applied to other Drummond types. The class was coupled to a six-wheeled tender as standard, although from time to time they had the Drummond eight-wheeled 'watercart' by way of tender interchange.

Eight locomotives were converted to oil firing as part of government trials in 1947 to 1948.

None have survived.

Construction table

YearBatchQuantityLSWR numbersNotes
1903
L11
5
154–158
1903
O11
5
159, 161, 163–165
1904
D12
5
134, 148, 166–168
1904
F12
5
169–173
1906
K13
5
174, 175, 407–409
1906
M13
5
410–414
1906
P13
5
405, 406, 435–437
1907
S13
5
438–442

Livery and numbering

LSWR and Southern

Under the LSWR, the L11s were outshopped in the LSWR Passenger Sage Green livery with purple-brown edging, creating panels of green.[1] This was further lined in white and black with 'LSWR' in gilt on the tender tank sides.

When transferred to Southern Railway ownership after 1923, the locomotives were outshopped in Richard Maunsell's darker version of the LSWR livery.[2] The LSWR standard gilt lettering was changed to yellow with 'Southern' on the water tank sides. The locomotives also featured black and white lining.[3]

Post-1948 (nationalisation)

BR No. 30166 pictured on shed

Livery after Nationalisation was initially Southern freight livery with 'British Railways' on the tender, and an 'S' prefix on the number. The class was subsequently outshopped in BR Mixed Traffic Black with red and white lining, with the BR crest on the tender.[4]

Locomotive numbering was per BR standard practice, with 40 locomotives passing into British Railways ownership in 1948 and they were numbered randomly (with other LSWR classes) in the ranges 30134-30175, 30405-30414, 30435-30442. Numbering was based upon the batches built. However, thirteen of the locomotives had been withdrawn by the end of 1948, resulting in gaps in the sequence.[4]

Comparison with K10

According to Dendy Marshall,[5] the main differences between the K10 "Small Hoppers" and the L11 "Large Hoppers" were:

References

  1. 1 2 Bradley (1986).
  2. ↑ Swift (2006).
  3. ↑ Haresnape & Rowledge (1982).
  4. 1 2 Longworth (2005).
  5. ↑ Dendy Marshall & Kidner (1963), p. 176
  • ABC of British Railways Locomotives, part 2 (1949 ed.). Ian Allan. 
  • Bradley, D. L. (1986). LSWR Locomotives: The Drummond Classes. Didcot, Oxon: Wild Swan Publications. ISBN 0-906867-42-8. 
  • Dendy Marshall, C.F.; Kidner, R.W. (1963) [1937]. History of the Southern Railway (2nd ed.). Shepperton: Ian Allan. ISBN 0-7110-0059-X. 
  • Haresnape, B. & Rowledge, P. (1982). Drummond Locomotives: A Pictorial History. Hinckley: Ian Allan Publishing. ISBN 0-7110-1206-7. 
  • Longworth, Hugh (2005). British Railway Steam Locomotives: 1948–1968. Oxford Publishing Company. ISBN 0-86093-593-0. 
  • Swift, Peter (2006). Maunsell 4-6-0 King Arthur Class. Locomotives in Detail, volume 4. Hinckley: Ian Allan Publishing. ISBN 0-7110-3086-3. 
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