GER Class D27

The GER Class D27 was a class of 2-2-2 steam tender locomotives designed by James Holden for the Great Eastern Railway.

GER Class D27
GER 1000, the first of the 1893 batch
Type and origin
Power typeSteam
DesignerJames Holden
BuilderStratford Works
Build date1889–1893
Total produced21
Specifications
Configuration:
​
 • Whyte2-2-2
 • UIC1A1 n2
Gauge4 ft 8 1⁄2 in (1,435 mm)
Leading dia.4 ft 0 in (1.219 m)
Driver dia.7 ft 0 in (2.134 m)
Trailing dia.4 ft 0 in (1.219 m)
Wheelbase36 ft 7 in (11.15 m)
Length48 ft 2 in (14.68 m) over buffers
Adhesive weight17 long tons 10 cwt (39,200 lb or 17.8 t)
Loco weight40 long tons 3.5 cwt (90,000 lb or 40.8 t)
Fuel typeCoal, some fuel oil
Firebox:
 • Firegrate area		18.0 sq ft (1.67 m2)
Boiler pressure140 lbf/in2 (965 kPa) later 160 lbf/in2 (1,103 kPa)
Heating surface1,199.5 sq ft (111.44 m2)
CylindersTwo, inside
Cylinder size18 in × 24 in (460 mm × 610 mm), later 18 in × 24 in (460 mm × 610 mm)
Performance figures
Tractive effort11,016 lbf (49.00 kN), later 13,114 lbf (58.33 kN)
Career
OperatorsGreat Eastern Railway
ClassD27
Withdrawn1901–1907
DispositionAll Scrapped

History

In 1888 Holden experimented by removing the side rods of T19 No. 721 to form a 2-2-2.[1] In 1889 the first of a new class appeared: initially No. 740 (later 789 and 780) which had been built on a 'Locomotive and Machinery' account. This was followed by two batches of ten on the more normal 'Letter' account.[2] in 1893. They were built with 18-by-24-inch (457 mm × 610 mm)[3] inside cylinders powered by a 140-pound-force-per-square-inch (965 kPa) boiler. They were later rebuilt with 18-by-25-inch (457 mm × 635 mm) and 160-pound-force-per-square-inch (1,103 kPa) boilers.[2]

Table of orders and numbers[2]
YearOrder no.ManufacturerQuantityGER Nos.Notes
1889LM68Stratford Works1740Renumbered 789, then 780
1891D27Stratford Works10770–779
1893F32Stratford Works101000–1009

One of their main spheres was on the Joint Line working expresses to York. In 1896 the class inaugurated the epic making non-stop run to North Walsham using oil-firing. Rous-Martin[4] found that the singles climbed Brentwood Bank more rapidly than the 2-4-0s. See also Ahrons (1951).

Nine locomotives were withdrawn between 1901 and 1903. The surviving eight locomotives in the 770-series were transferred to the duplicate list in July 1904, and had their number prefixed with a "0". The remaining fourteen were withdrawn between 1904 and 1907.[5]

Table of withdrawals[5]
YearQuantity in
service at
start of year		Quantity
withdrawn		Locomotive numbers
19012141000, 1002, 1005, 1007
1902173773, 1001, 1003
19031421008, 1009
1904124775, 0771, 1004, 1006
1905840772, 0774, 0777, 0780
1906410770
1907330776, 0778, 0779

References
  1. Allen 1961, p. 114
  2. Aldrich 1969, p. 34
  3. Rous-Marten 1902, p. 272
  4. Rous-Marten 1898a
  5. Aldrich 1969, p. 35
  • Ahrons, E. L. (1951). Asher, L. L. (ed.). Locomotive and train working in the latter part of the nineteenth century. (Volume 1). Cambridge: Heffer.
  • Aldrich, C. Langley (1969). The Locomotives of the Great Eastern Railway 1862–1962 (7th ed.). Wickford, Essex: C. Langley Aldrich. OCLC 30278831.
  • Allen, C. J. (1961). The Great Eastern Railway, 3rd edition (3rd ed.). London: Ian Allan.
  • Rous-Marten, C. (1898a). British express engines. Int. Rly Congress.
  • Rous-Marten, C. (1902). Railway Magazine. 11: 272. Missing or empty |title= (help)
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