| Queensland Railways B18¼ class | |
| Powertype: | Steam |
| Builder: | North Ipswich Railway Workshops (59) Walkers Limited (24) |
| Builddate: | 1926-1947 |
| Totalproduction: | 83 |
| Whytetype: | 4-6-2 |
| Driverdiameter: | 4feet |
| Locoweight: | 56.3LT |
| Tenderweight: | 36.9LT |
| Fueltype: | Coal |
| Fuelcap: | 8LT |
| Watercap: | 3000impgal |
| Boilerpressure: | 1700NaN0 |
| Firearea: | 25square feet |
| Tubearea: | 1511square feet (as built) 1478square feet (1935 reboilering) 1414square feet (1936 reboilering) |
| Totalsurface: | 1957square feet (as built) 1923square feet (1935 reboilering) 1859square feet (1936 reboilering) |
| Cylindercount: | 2 outside |
| Cylindersize: | 18.25x |
| Valvegear: | Walschaerts |
| Maxspeed: | 50mph |
| Tractiveeffort: | 226481NaN1 |
| Factorofadhesion: | 3.54 |
| Operator: | Queensland Railways |
| Fleetnumbers: | 16, 18, 28, 30, 40, 52, 84, 227-232, 768-771, 827-830, 841-852, 864-881, 887-916 |
| Preservedunits: | 771 |
| Disposition: | 1 preserved, 82 scrapped |
The Queensland Railways B18¼ class locomotive was a class of 4-6-2 steam locomotives operated by the Queensland Railways.
The first batch of 17 B18¼ class locomotive were built by the North Ipswich Railway Workshops in 1926. Per Queensland Railway's classification system they were designated the B18 class, B representing they had three driving axles, and the 18 the cylinder diameter in inches.[1] [2] [3]
Further orders saw the class total 83 by 1947 with some built by Walkers Limited. The latter examples were fitted with modified boilers and improved cabs. The early examples were painted prussian blue with the boilers having a natural finish. The latter examples were painted black with red lining. In 1949 all were repainted green with red lining. From 1951 they began to be relegated following the delivery of the BB18¼ class. The first was withdrawn in March 1967, with the last removed from traffic in 1970.[1] [2] [3]