GER Class T77
The GER Class T77 was a class of twenty-five 0-6-0 steam locomotives designed by A. J. Hill for the Great Eastern Railway. They all passed to the London and North Eastern Railway at the 1923 grouping and received the classification J19.
History
These locomotives were a development of the GER Class E72, and shared the same cylinders, wheels, and Belpaire firebox-fitted boiler. Changes included vacuum brakes from new, and the abandonment of cylinder tail rods.| Year | Order | Manufacturer | Quantity | GER Nos. | LNER Nos. | 1946 Nos. | Notes |
| 1916–17 | T77 | Stratford Works | 10 | 1140–1149 | 8140–8149 | 4650–4659 | |
| 1917–18 | H80 | Stratford Works | 5 | 1260–1264 | 8260–8264 | 4660–4664 | |
| 1918–19 | X80 | Stratford Works | 5 | 1265–1269 | 8265–8269 | 4665–4669 | |
| 1920 | A81 | Stratford Works | 5 | 1250–1254 | 8250–8254 | 4670–4674 |
All were still in service at the 1923 grouping, the LNER adding 7000 to the numbers of nearly all the ex-Great Eastern locomotives, including the Class T77 locomotives. Between 1934 and 1939 all were rebuilt with round-top fireboxes, and the cylinder bore was reduced to. The rebuilt locomotives were reclassified J19/2, while the yet-to-be rebuilt locomotives reclassified J19/1. The J19/2 classification also included the rebuilt former Class E72 locomotives.
At nationalisation in 1948, British Railways added 60000 to their LNER numbers. They all continued in service until 1959, when the first was withdrawn; all were gone by the end of 1962.
| Year | Quantity in service at start of year | Quantity withdrawn | Locomotive numbers | Notes |
| 1959 | 25 | 8 | 64651/58/61–62/65/68/70/72 | |
| 1960 | 17 | 6 | 64650/54/56/59–60/63 | |
| 1961 | 11 | 7 | 64652–53/55/66–67/69/74 | |
| 1962 | 4 | 4 | 64657/64/71/73 |