| Type | Introduced | Front dia | Rear dia | Length | Firebox len | Pressure range | Used by |
|---|---|---|---|---|---|---|---|
| 1 | 1903 | 4 ft 11 in (1.499 m) | 5 ft 6 in (1.676 m) | 14 ft 10 in (4.521 m) | 9 ft 0 in (2.743 m) | 200–225 psi (1.38–1.55 MPa) | Saint, 2800 & 2884, Star, Hall & Modified Hall and Grange classes |
| 2 | 1903 | 4 ft 5 in (1.346 m) | 5 ft 0 in (1.524 m) | 11 ft 0 in (3.353 m) | 7 ft 0 in (2.134 m) | 195–200 psi (1.34–1.38 MPa) | Aberdare, Bulldog & Bird, County Tank, 5600, 3100 (1903), 5101, 6100 and 8100 classes |
| 3 | 1903 | 4 ft 5 in (1.346 m) | 5 ft 0 in (1.524 m) | 10 ft 3 in (3.124 m) | 7 ft 0 in (2.134 m) | 195–200 psi (1.34–1.38 MPa) | Bulldog & Bird and 3600 'Birdcage' classes |
| 4 | 1902 | 4 ft 11 in (1.499 m) | 5 ft 6 in (1.676 m) | 11 ft 0 in (3.353 m) | 7 ft 0 in (2.134 m) | 195–200 psi (1.34–1.38 MPa) | City, Churchward County, 3150, 4200, 4300 'Mogul', 5205, 7200 and 3100 (1938) classes |
| 5 | 1904 | 4 ft 2 in (1.270 m) | 4 ft 9 in (1.448 m) | 10 ft 6 in (3.200 m) | 5 ft 10 in (1.778 m) | 165–200 psi (1.14–1.38 MPa) | 4400, 4500 & 4575 and 4600 classes |
| 6 | 1908 | 5 ft 6 in (1.676 m) | 6 ft 0 in (1.829 m) | 23 ft 0 in (7.010 m) | 8 ft 0 in (2.438 m) | 225 psi (1.55 MPa) | 111 The Great Bear |
| 7 | 1921 | 5 ft 6 in (1.676 m) | 6 ft 0 in (1.829 m) | 14 ft 10 in (4.521 m) | 10 ft 0 in (3.048 m) | 225 psi (1.55 MPa) | 4700 class |
| 8 | 1923 | 5 ft 2 in (1.575 m) | 5 ft 9 in (1.753 m) | 14 ft 10 in (4.521 m) | 10 ft 0 in (3.048 m) | 225 psi (1.55 MPa) | Castle class |
| 9 | 1924 | 4 ft 4 in (1.321 m) | 4 ft 5 in (1.346 m) | 10 ft 3 in (3.124 m) | 6 ft 6 in (1.981 m) | 150–165 psi (1.03–1.14 MPa) | Absorbed locos |
| 10 | 1924 | 4 ft 5 in (1.346 m) | 5 ft 4 in (1.626 m) | 10 ft 3 in (3.124 m) | 6 ft (1.829 m) | 150–200 psi (1.03–1.38 MPa) | 2251, 9400 and 1500 classes |
| 11 | 1924 | 4 ft 2 in (1.270 m) | 4 ft 3 in (1.295 m) | 10 ft 6 in (3.200 m) | 5 ft 6 in (1.676 m) | 150–165 psi (1.03–1.14 MPa) | Absorbed locos |
| 12 | 1927 | 5 ft 6 in (1.676 m) | 6 ft (1.829 m) | 16 ft (4.877 m) | 11 ft 6 in (3.505 m) | 250 psi (1.72 MPa) | King class |
| 14 | 1938 | 4 ft 8 in (1.422 m) | 5 ft 3 in (1.600 m) | 12 ft 6 in (3.810 m) | 8 ft 8 in (2.642 m) | 225 psi (1.55 MPa) | Manor class |
| 15 | 1945 | 5 ft (1.524 m) | 5 ft 8 in (1.727 m) | 12 ft 7 in (3.835 m) | 9 ft 9 in (2.972 m) | 280 psi (1.93 MPa) | Hawksworth County class |
| 16 | 1949 | 3 ft 9 in (1.143 m) | 3 ft 10 in (1.168 m) | 10 ft 1 in (3.073 m) | 5 ft (1.524 m) | 165 psi (1.14 MPa) | 1600 class |
| 21 | 1931 | 4 ft 2 in (1.270 m) | 4 ft 3 in (1.295 m) | 10 ft 6 in (3.200 m) | 5 ft 6 in (1.676 m) | 165–180 psi (1.14–1.24 MPa) | 5400 and 6400 classes |