GER Class S69
|GER Class S69
LNER Class B12
B12/4 4-6-0 No. 61504 at Keith Locomotive Depot 1948
|Designer||S. D. Holden|
|Builder||GER Stratford Works (51),
Wm. Beardmore & Co. (20),
Beyer, Peacock & Co. (10)
|Serial number||WB 135–154,
|UIC classification||2′C h2t|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|3 ft 3 in (0.991 m)|
|Driver diameter||6 ft 6 in (1.981 m)|
|Wheelbase||48 ft 3 in (14.71 m)|
|Length||57 ft 7 in (17.55 m) over buffers|
|Weight on drivers||B12/1&2: 43 tons 8 cwt (97,200 lb or 44.1 t)
B12/3: 48 tons 2 cwt (107,700 lb or 48.9 t)
|Locomotive weight||B12/1&2: 62 tons 19.5 cwt (141,100 lb or 64.0 t)
B12/3: 69 tons 5 cwt (155,100 lb or 70.4 t)
|Tender weight||38 tons 6 cwt (85,800 lb or 38.9 t)|
|Fuel capacity||4 tons 0 cwt (9,000 lb or 4.1 t)|
|Water capacity||3,700 imp gal (16,800 l; 4,440 US gal)|
|Boiler pressure||180 psi (1.24 MPa)|
|Firegrate area||26.5 sq ft (2.46 m2)|
|154 sq ft (14.3 m2)|
|– Total||1,919 sq ft (178.3 m2)|
|Cylinder size||20 in × 28 in (510 mm × 710 mm)|
|Tractive effort||21,969 lbf (97.72 kN)|
|Railroad(s)||GER · LNER · BR|
|Power class||BR: 4P3F|
|Axle load class||LNER/BR: RA 4|
|Withdrawn||1913 (1), 1945–1961|
|Disposition||One preserved, remainder scrapped|
Great Eastern Railway (GER) Class S69, also known as 1500 Class, and later classified B12 by the LNER is a class of 4-6-0 steam locomotive designed to haul express passenger trains from London Liverpool Street station along the Great Eastern Main Line. Originally they were designed by S. D. Holden, but were much rebuilt, resulting in several subclasses.
Seventy-one S69 locomotives were built by the GER between 1911 and 1921 and numbered 1500–1570. A further 10 locomotives were built by Beyer, Peacock & Co for the LNER in 1928 and numbered 8571-8580. From 1948 the British Railways numbers were 61500–61580 (with gaps).
At the time of their introduction, the "Claud Hamilton" 4-4-0s were becoming outclassed on the heaviest express. Although an enlarged 4-4-0 design was mooted, it was realised that any such design would have too high an axle load for the tracks of the Great Eastern Railway, which had a relatively low restriction. Another design constraint was the short turntables used at the time. This meant that a 4-6-0 design was decided upon, although the design was relatively short compared to similar designs introduced at the same time.
|Year||Order||Manufacturer||Quantity||GER Nos.||LNER Nos.||LNER 1944 Nos.||Notes|
|1913||A73||Stratford Works||10||1505–1514||8505, —, 8507–8514||1505, —, 1507–1514||1506 withdrawn after accident at Colchester, 12 July 1913|
|1920–21||—||Wm. Beardmore & Co. 135–154||20||1541–1560||8541–8560||1541–1560|
|1928||—||Beyer, Peacock & Co. 6487–6496||10||—||8571–8580||1571–1580|
- B12/1 Introduced 1911, GER locos with 5-foot-1 1⁄8-inch (1,553 mm) diameter boiler and Belpaire firebox.
- B12/2 Introduced 1926, locos fitted with Lentz poppet valves: ten 1928-built LNER locomotives and six rebuilt GER locomotives: 8516/19/25/32/33/40. 
- B12/3 Introduced 1932, LNER rebuild of B12/1 with 5-foot-6-inch (1,676 mm) diameter boiler and round-topped firebox (Diagram 99A).
- B12/4 Introduced 1943, LNER rebuild of B12/1 with 5-foot-1 1⁄8-inch (1,553 mm) diameter boiler and round-topped firebox (Diagram 25A) for Scottish lines with limited axle-load – Comprised nine locomotives: 1500/04/05/07/08/11/24/26/32.
The poppet valves were not a great success and all the B12/2s were converted to piston valve engines between 1931 and 1934.
Accidents and incidents
- On 12 July 1913, locomotive No. 1506 was hauling an express passenger train which collided with a light engine at Colchester, Essex due to a signalman's error. Three people were killed and fourteen were injured. The brand new locomotive was so severely damaged that only its boiler was salvaged.
- On 10 February 1941, locomotive No. 8556 was hauling a passenger train that overran signals and was in a rear-end collision between Harold Wood and Brentwood, Essex. Seven people were killed and seventeen were seriously injured.
- On 2 January 1947, locomotive No. 1565 was hauling a passenger train that was run into by an express passenger train at Gidea Park, Essex. The express had overrun signals. Seven people were killed, 45 were hospitalised.
- Aldrich, C. Langley (1969). The Locomotives of the Great Eastern Railway 1862–1962 (7th ed.). Wickford, Essex: C. Langley Aldrich. OCLC 30278831.
- 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 1975). Fry, E. V., ed. Locomotives of the L.N.E.R., Part 2B: Tender Engines—Classes B1 to B19. Lincoln: RCTS. ISBN 0-901115-73-8.
- Earnshaw, Alan (1991). Trains in Trouble: Vol. 7. Penryn: Atlantic Books. ISBN 0-906899-50-8.
- Hughes, Geoffery (1988). LNER 4-6-0s At Work. Book Law Publications. ISBN 1-901945-06-5.
- Phillips, Charles (1982). Essex Steam. King's Lynn: Becknell Books. ISBN 0-907087-10-8.
- Trevena, Arthur (1981). Trains in Trouble: Vol. 2. Redruth: Atlantic Books. ISBN 0-906899-03-6.
|Wikimedia Commons has media related to GER Class S69 / LNER Class B12.|
- The S.D. Holden B12 (GER Class S69 / "1500"s) 4-6-0s — LNER Encyclopedia