Queensland BB18¼ class locomotive
1079 passing through Enoggera station in April 2009
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| Type and origin | |
|---|---|
| Power type | Steam |
| Build date | 1950-1958 |
| Total produced | 55 |
| Specifications | |
|---|---|
| Configuration | 4-6-2 |
| Gauge | 1,067 mm (3 ft 6 in) |
| Driver dia. | 4 ft 3 in (1,295 mm) |
| Length | 60 ft 2 in (18.34 m) |
| Height | 12 ft 6 in (3.81 m) |
| Axle load | 12.1 long tons (13.6 short tons; 12.3 t) |
| Loco weight | 58.0 long tons (65.0 short tons; 58.9 t) |
| Tender weight | 43.2 long tons (48.4 short tons; 43.9 t) |
| Total weight | 101.2 long tons (113.3 short tons; 102.8 t) |
| Fuel type | Coal |
| Fuel capacity | 10.3 long tons (11.5 short tons; 10.5 t) |
| Water cap | 3,500 imp gal (16,000 l; 4,200 US gal) |
| Firebox: • Firegrate area |
25 sq ft (2.3 m2) |
| Boiler pressure | 170 lbf/in2 (1,172 kPa) |
| Heating surface | 1,858 sq ft (172.6 m2) |
| Cylinder size | 18.25 in × 24 in (464 mm × 610 mm) |
| Valve gear | Walschaerts |
| Performance figures | |
|---|---|
| Tractive effort | 22,648 lbf (100.7 kN) |
| Factor of adh. | 3.59 |
| Career | |
|---|---|
| Operators | Queensland Railways |
| Numbers | 1011-1045, 1070-1089 |
| Preserved | 1037, 1072, 1077, 1079, 1086, 1089 |
| Disposition | 6 preserved, 49 scrapped |
The Queensland Railways BB18¼ class locomotive was a class of 4-6-2 steam locomotives operated by the Queensland Railways.
The first 35 BB18¼ class locomotives were built by the Vulcan Foundry in Newton-le-Willows, England in 1950/51. Per Queensland Railway's classification system they were designated the BB18¼ class, BB representing they had three driving axles, and the 18¼ the cylinder diameter in inches.
A further 20 built by Walkers Limited, Maryborough between 1955 and 1958. No. 1089 was the last steam engine placed into service on a mainline Australian railway. They mainly operated in Southern and Central Queensland out of Mayne (Brisbane), Toowoomba and Rockhampton. After track strengthening, their sphere of operation was extended to Wallangarra, Roma, Hughenden and Bogantungan.
They initially operated express passenger services, later being relegated to suburban passenger and freight services. The class was withdrawn from service after 1967, with the last example removed upon the completion of dieselisation in 1970.
The BB18¼ class locomotive is a type of 4-6-2 steam locomotive operated by the Queensland Railways. They were an improved version of the B18¼ class.
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Wikipedia