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LNER Thompson Class L1








LNER Thompson Class L1


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LNER Thompson Class L1[1]

Neasden loco shed geograph-2361104-by-Ben-Brooksbank.jpg
No. 67781 at Neasden Shed 1957











Type and origin
Power typeSteam
DesignerEdward Thompson
Builder

  • Doncaster Works (1)


  • Darlington Works (29)


  • North British Locomotive Co. (35)


  • Robert Stephenson and Hawthorns (35)

Build date1945, 1948–1950
Total produced100




















































Specifications
Configuration:
 • Whyte
2-6-4T
 • UIC
1′C2′ h2t
Gauge
4 ft 8 12 in (1,435 mm)
Leading dia.3 ft 2 in (0.965 m)

Driver dia.
5 ft 2 in (1.575 m)
Trailing dia.3 ft 2 in (0.965 m)
Length43 ft 4 in (13.21 m)
Axle load20.00 long tons (20.32 t)
Adhesive weight58.95 long tons (59.90 t)
Loco weight89.45 long tons (90.89 t)
Fuel typeCoal
Fuel capacity4.50 long tons (4.57 t)
Water cap2,630 imp gal (12,000 l; 3,160 US gal)
Firebox:
 • Firegrate area
24.75 sq ft (2.299 m2)
BoilerLNER diagram 115
Boiler pressure225 lbf/in2 (1.55 MPa), 200 lbf/in2 (1.38 MPa)
Heating surface1,336.5 sq ft (124.16 m2)
 • Tubes830.0 sq ft (77.11 m2)
 • Flues368.0 sq ft (34.19 m2)
 • Firebox138.5 sq ft (12.87 m2)
Superheater:
 • Heating area284.0 sq ft (26.38 m2)
CylindersTwo, outside
Cylinder size20 in × 26 in (508 mm × 660 mm), 18.75 in × 26 in (476 mm × 660 mm) on some engines
Valve type10-inch (254 mm) piston valves


Performance figures
Tractive effort32,080 lbf (142.70 kN) on most engines, between 25,063 lbf (111.49 kN) and 28,516 lbf (126.85 kN) on some engines experimentally














Career
Operators
  • London and North Eastern Railway

  • North Eastern Region of British Railways

ClassL1
Power classBR: 4MT
NumbersBR: 67701–67800
Axle load class
Route Availability 7
Withdrawn1960–1962
DispositionAll scrapped

The London and North Eastern Railway (LNER) Thompson Class L1 was a class of 2-6-4T steam locomotives designed by Edward Thompson. The prototype no. 9000 was built in 1945, but the remaining 99 were built under British Railways jurisdiction in the period 1948–1950.




Contents





  • 1 Overview


  • 2 Accidents and incidents


  • 3 Modifications


  • 4 Numbering


  • 5 Withdrawal


  • 6 Modelling


  • 7 References




Overview[edit]


The class, at least on paper, should have been very free steaming and powerful engines but, in practice, they were not suited to the work to which they were assigned. The engines had 5-foot-2-inch (1.575 m) driving wheels, which would give them excellent power at low speed, such as that required for freight work, but these engines were intended for passenger use. The speeds required for suburban passenger work wore the engines out in a remarkably short time. Axleboxes, crosshead slides and crank bearings all suffered due to the high speeds.



Accidents and incidents[edit]


  • On 19 November 1958, a freight train overran signals and was in a rear-end collision with another at Hitchin, Hertfordshire. A third freight train ran into the wreckage and was derailed. Locomotive No. 67785 was pushed over by the wagons from the third train.[2]


Modifications[edit]


In an attempt to reduce wear, two experiments were tried.[3] In May 1951, five locomotives had liners fitted to their cylinders to reduce the cylinder bore from 20 to 18 34 in (508 to 476 mm). In March 1953, five locomotives had their boiler pressure reduced from 225 to 200 lbf/in2 (1.55 to 1.38 MPa). Neither experiment was a success.



Numbering[edit]







































Class numbering details[3][4][5]
Build date
Builder
Serial number
LNER number
Original BR number
New BR number
1945
LNER Doncaster Works
1984
9000
69000
67701
1948
BR Darlington Works
2020–2034
9001–9003, E9004–E9012
69001-69015
67702-67716
1948
BR Darlington Works
2035–2048


67717-67730
1948–1949

North British Locomotive Company
26570–26604


67731-67765
1949–1950

Robert Stephenson and Hawthorns
7500–7534


67766-67800


Withdrawal[edit]


Withdrawals were between 1960 and 1962. None survived to preservation.



Modelling[edit]


Hornby produces the L1 class in 00 gauge with a number of different liveries, both green with LNER or BR running numbers,[6][7] and black with BR running numbers.[8][9]



References[edit]






  1. ^ Boddy et al. 1977, p. 16, 29–31.


  2. ^ Trevena, Arthur (1981). Trains in Trouble: Vol. 2. Redruth: Atlantic Books. pp. 40–41. ISBN 0-906899-03-6..mw-parser-output cite.citationfont-style:inherit.mw-parser-output qquotes:"""""""'""'".mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em


  3. ^ ab "The Thompson L1 2-6-4T Tank Locomotives". LNER Encyclopedia.


  4. ^ "Class Details". RailUK.


  5. ^ Boddy et al. 1977, p. 16.


  6. ^ "(404)". Hornby. Archived from the original on 19 November 2010.


  7. ^ "(404)". Hornby. Archived from the original on 2011-07-20.


  8. ^ "(404)". Hornby. Archived from the original on 2011-07-20.


  9. ^ "National Model Rail Database". National Model Rail. Archived from the original on 4 March 2016. Retrieved 13 September 2015.




  • Boddy, M. G.; Brown, W. A.; Fry, E. V.; Hennigan, W.; Hoole, Ken; Manners, F.; Neve, E.; Platt, E. N. T.; Proud, P.; Yeadon, W. B. (March 1977). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 9A: Tank Engines—Classes L1 to N19. Kenilworth: RCTS. ISBN 0-901115-40-1.








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