Queensland BB18¼ class locomotive

Queensland Railways BB18¼ class
1079 passing through Enoggera station in April 2009
Type and origin
Power typeSteam
BuilderVulcan Foundry, Walkers Limited
Build date1950-1958
Total produced55
Specifications
Configuration:
​
 • Whyte4-6-2
Gauge1,067 mm (3 ft 6 in)
Driver dia.4 ft 3 in (1,295 mm)
Length60 ft 2 in (18.34 m)
Height12 ft 6 in (3.81 m)
Axle load12.1 long tons (13.6 short tons; 12.3 t)
Loco weight58.0 long tons (65.0 short tons; 58.9 t)
Tender weight43.2 long tons (48.4 short tons; 43.9 t)
Total weight101.2 long tons (113.3 short tons; 102.8 t)
Fuel typeCoal
Fuel capacity10.3 long tons (11.5 short tons; 10.5 t)
Water cap.3,500 imp gal (16,000 L; 4,200 US gal)
Firebox:​
 • Grate area25 sq ft (2.3 m2)
Boiler pressure170 lbf/in2 (1,172 kPa)
Heating surface1,858 sq ft (172.6 m2)
Cylinder size18.25 in × 24 in (464 mm × 610 mm)
Valve gearWalschaerts
Performance figures
Tractive effort22,648 lbf (100.7 kN)
Factor of adh.3.59
Career
OperatorsQueensland Railways
Numbers1011-1045, 1070-1089
Preserved1037, 1072, 1077, 1079, 1086, 1089
Disposition6 preserved, 49 scrapped

The Queensland Railways BB18¼ class locomotive was a class of 4-6-2 steam locomotives operated by the Queensland Railways.

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