LNER Thompson Class A2/3

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Disambiguation: LNER Thompson Class A2
LNER Thompson Class A2/3
Thompson Class A2 Pacfic at Grantham Locomotive Depot-Geograph-2272186-by-Ben-Brooksbank.jpg
No. 517 Ocean Swell in 1947
Type and origin
Power type Steam
Build date 1946
Total produced 15
Specifications
Configuration 4-6-2
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 6 ft 2 in (1.880 m)
Locomotive weight 101.5 long tons (103.1 t)
Boiler pressure 250 psi (1.72 MPa)
Cylinders Three
Cylinder size 19 in × 26 in (483 mm × 660 mm)
Performance figures
Tractive effort 40,430 lbf (179.84 kN)
Career
Operator(s) London and North Eastern Railway
British Railways
Class A2/3
Power class 8P7F
Number(s) LNER 500 and 511-524
BR 60500 and 60511-60524
Disposition All Scrapped

The London and North Eastern Railway (LNER) Class A2/3 was a class of 4-6-2 steam locomotives.

They were newly constructed locomotives, fulfilling the requirement identified by Edward Thompson for a standard express passenger locomotive of the 4-6-2 arrangement with 6 ft 2in driving wheels. Fifteen engines were constructed according to this original design, but following the retirement of Thompson as CME, the remaining fifteen locomotives that were planned were immediately redesigned and ultimately emerged as Peppercorn Class A2. The information in the infobox (right) is taken from Ian Allan ABC.[1]

According to OS Nock, the class were regarded as being effective performers, but suffered from a defect of exhaust detail, this being attributed to the long steam passages from the cylinders to the blastpipe, a fault with engines that have substantial distances between the inside and outside cylinders, which was a characteristic Thompson Pacific design. the long frames and long connecting rods caused a substantial amount of frame shift, and the class were known for shaking bolts loose.

Stock list[edit]

LNER
No.
BR No. Name Entered stock Withdrawn
500 60500 Edward Thompson May 1946 June 1963
511 60511 Airborne July 1946 November 1962
512 60512 Steady Aim August 1946 June 1965
513 60513 Dante August 1946 April 1963
514 60514 Chamossaire September 1946 December 1962
515 60515 Sun Stream October 1946 November 1962
516 60516 Hycilla November 1946 November 1962
517 60517 Ocean Swell November 1946 November 1962
518 60518 Tehran December 1946 November 1962
519 60519 Honeyway February 1947 December 1962
520 60520 Owen Tudor March 1947 June 1963
521 60521 Watling Street May 1947 November 1962
522 60522 Straight Deal June 1947 June 1965
523 60523 Sun Castle August 1947 June 1963
524 60524 Herringbone September 1947 February 1965
No. 60500, 'Edward Thompson' entering Retford 6 September 1962.
With the exception of 60500 all of the locomotives were named after the winners of major flat races in the immediate postwar period:
  • St. Leger Stakes
    • 1941 Sun Castle
    • 1943 Herringbone
    • 1944 Tehran
    • 1945 Chamossaire
    • 1946 Airborne
  • Oaks Stakes
    • 1944 Hycilla
    • 1945 Sun Stream
    • 1946 Steady Aim

Accidents and incidents[edit]

Withdrawal[edit]

The A2/3s were withdrawn from stock as follows. None was preserved.

Year No. Withdrawn Nos
1962 8 60511/4-9/21
1963 4 60500/13/20/3
1964 0 -
1965 3 60512/22/4

Models[edit]

Apple Green Engines produce a ready-to-run model of the A2/3 in 4mm scale. PDK and DJH both sell 4mm scale kits of the A2/3. Crownline have also produced a 4mm scale kit, but this is no longer available.

DJH also sell a kit of the A2/3 for O gauge (7mm scale).

References[edit]

  1. ^ Ian Allan ABC of British Railways Locomotives, summer 1961 edition, part 4, page 27
  2. ^ Trevena, Arthur (1980). Trains in Trouble. Vol. 1. Redruth: Atlantic Books. p. 46. ISBN 0-906899-01-X. 
  • Boddy, M. G.; Neve, E.; Yeadon, W. B. (April 1973). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 2A: Tender Engines—Classes A1 to A10. Kenilworth: RCTS. ISBN 0-901115-25-8. 
  • Yeadon, W. B. (1991). Yeadon's Register of LNER Locomotives, volume 3: Raven, Thompson & Peppercorn Pacifics. Irwell Press. 

External links[edit]