LNER Thompson Class A2/3
- Disambiguation: LNER Thompson Class A2
|LNER Thompson Class A2/3|
No. 517 Ocean Swell in 1947
|Type and origin|
|Gauge||4 ft 8 1⁄2 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)|
|Cylinder size||19 in × 26 in (483 mm × 660 mm)|
|Tractive effort||40,430 lbf (179.84 kN)|
|Operator(s)||London and North Eastern Railway
|Number(s)||LNER 500 and 511-524
BR 60500 and 60511-60524
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.
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.
|BR No.||Name||Entered stock||Withdrawn|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|
- With the exception of 60500 all of the locomotives were named after the winners of major flat races in the immediate postwar period:
Accidents and incidents
- On 7 January 1957, No. 60520 Owen Tudor was hauling an express passenger train which overran signals and crashed into the rear of a local train at Welwyn Garden City, Hertfordshire.
The A2/3s were withdrawn from stock as follows. None was preserved.
|This section does not cite any references or sources. (April 2013)|
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).
- 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.