| GER Class D27 | |
| Powertype: | Steam |
| Designer: | James Holden |
| Builder: | Stratford Works |
| Builddate: | 1889–1893 |
| Totalproduction: | 21 |
| Whytetype: | 2-2-2 |
| Uicclass: | 1A1 n2 |
| Leadingdiameter: | 4feet |
| Driverdiameter: | 7feet |
| Trailingdiameter: | 4feet |
| Wheelbase: | 36feet |
| Length: | 48feet over buffers |
| Fueltype: | Coal, some fuel oil |
| Boilerpressure: | 1400NaN0 later 1600NaN0 |
| Firearea: | 18sigfig=3NaNsigfig=3 |
| Totalsurface: | 1199.5square feet |
| Cylindercount: | Two, inside |
| Cylindersize: | 18inchesx24inchesin (xin), later 18inchesx24inchesin (xin) |
| Tractiveeffort: | 110162NaN2, later 131142NaN2 |
| Operator: | Great Eastern Railway |
| Operatorclass: | D27 |
| Withdrawndate: | 1901–1907 |
| Disposition: | All scrapped |
The GER Class D27 was a class of 2-2-2 steam tender locomotives designed by James Holden for the Great Eastern Railway.
In 1888, Holden experimented by removing the side rods of T19 No. 721 to form a 2-2-2. 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. in 1893. They were built with 18x inside cylinders powered by a 1400NaN0 boiler. They were later rebuilt with 18x and 1600NaN0 boilers.
| Year | Order no. | Manufacturer | Quantity | GER Nos. | Notes |
|---|---|---|---|---|---|
| 1889 | LM68 | 1 | 740 | Renumbered 789, then 780 | |
| 1891 | D27 | 10 | 770–779 | ||
| 1893 | F32 | 10 | 1000–1009 | ||
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[1] 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Nine locomotives were withdrawn between 1901 and 1903.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 The remaining fourteen were withdrawn between 1904 and 1907.
| 1901 | 21 | 4 | style=text-align:left | 1000, 1002, 1005, 1007 | |
| 1902 | 17 | 3 | style=text-align:left | 773, 1001, 1003 | |
| 1903 | 14 | 2 | style=text-align:left | 1008, 1009 | |
| 1904 | 12 | 4 | style=text-align:left | 775, 0771, 1004, 1006 | |
| 1905 | 8 | 4 | style=text-align:left | 0772, 0774, 0777, 0780 | |
| 1906 | 4 | 1 | style=text-align:left | 0770 | |
| 1907 | 3 | 3 | style=text-align:left | 0776, 0778, 0779 |