GWR 2600 Class
The Great Western Railway 2600 or Aberdare class was a class of 2-6-0 steam locomotive built between 1900 and 1907. They were a freight and light mineral development of the 3300 Bulldog and 4100 Badminton classes, both 4-4-0 locomotives. Therefore, the design was adapted and became a 2-6-0 type; the resulting locomotives were used for hauling coal trains between Aberdare and Swindon.
Numbering
The class began in 1900 with a prototype, No. 33, renumbered 2600 in 1912. The rest were numbered 2601–2680 and were built between 1901 and 1907.| Year | Quantity | Lots No. | Serial Nos. | Locomotive Nos. | Notes |
| 1900 | 1 | 128 | 1886 | 33 | renumbered 2600 in 1912 |
| 1901 | 20 | 131 | 1908–1927 | 2621–2640 | |
| 1901–02 | 20 | 133 | 1929–1948 | 2641–2680 | |
| 1902 | 20 | 135 | 1949–1968 | 2661–2680 | |
| 1903 | 10 | 123 | 1796–1805 | 2611–2620 | Lot and serial numbers out of sequence |
| 1906 | 1 | 156 | 2125 | 2601 | |
| 1906 | 9 | 166 | — | 2602–2610 | Renewal of 2602 Kruger class locomotives |