Queensland B16½ class locomotive

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Queensland Railways B16½ class
Queensland B16½ class locomotive.jpg
Type and origin
Power typeSteam
BuilderNorth Ipswich Railway Workshops
Build date1918
Total produced1
 • Whyte2-6-2
Gauge1,067 mm (3 ft 6 in)
Leading dia.2 ft 2 in (660 mm)
Driver dia.4 ft 0 in (1,219 mm)
Trailing dia.2 ft 2 in (660 mm)
Length47 ft 6 in (14.48 m)
Axle load12 tonnes (12 long tons; 13 short tons)
Loco weight54.15 tonnes (53.3 long tons; 59.7 short tons)
Tender weight21 tonnes (20.66834 long tons; 23.14854 short tons) (loco built 1918-1926)
33.4 tonnes (32.87250 long tons; 36.81720 short tons) (loco fitted with C16 tender 1926–1950)
Total weight75.15 tonnes (73.96312 long tons; 82.83870 short tons) (loco built 1918-1926)
87.55 tonnes (86.16728 long tons; 96.50736 short tons)(loco fitted with C16 tender 1926–1950)
Fuel typeCoke
Water cap1,200 imperial gallons (5,500 l; 1,400 US gal)(loco built 1918-1926)
3,000 imperial gallons (14,000 l; 3,600 US gal)(loco fitted with C16 tender 1926–1950)
 • Firegrate area
1,712 sq ft (159.1 m2) (loco built 1918-1926)
1,666 sq ft (154.8 m2) (loco built 1926–1950)
Boiler pressure175 psi (1,207 kPa)
Heating surface:
 • Tubes and flues
1,294 sq ft (120.2 m2) (loco built 1918-1926)
1,263 sq ft (117.3 m2) (loco built 1926–1950)
Cylinders2 outside
Cylinder size16.5 in × 22 in (419 mm × 559 mm)
Valve gearSouthern
Performance figures
Tractive effort16,442 pounds (7,458 kg) (80%)
Factor of adh.4.87
OperatorsQueensland Railways

The Queensland Railways B16½ class locomotive was a one-off 2-6-2 steam locomotive operated by the Queensland Railways.


In August 1918, the North Ipswich Railway Workshops completed an experimental locomotive designed to burn coke instead of coal in an attempt to reduce smoke nuisance caused by coal in Brisbane suburban tunnels. Per Queensland Railway's classification system it was designated the B16 class, B representing that it had three driving axles, and the 16 the cylinder diameter in inches. It was also experimentally built as a 2-6-2 and fitted with Southern valve gear. It was modified to burn coal in June 1927.[1][2]

To provide enough heating surface to generate sufficient steam through its projected use the firebox was made wider for greater burning capacity. The two wheel trailing truck enabled the fitting of a wide firebox, necessary for a coke burning locomotive. The engine was originally fitted with the surplus tender from PB15 N° 411 after it was converted to a one off member of the 6D15 class. The tender was later changed to a standard C16 class locomotive tender to increase its potential range. The engine spent its working life on the Brisbane to Ipswich line working coal trains. It was withdrawn in February 1950.[1][2]


  1. ^ a b Armstrong, John (1994). Locomotives in the Tropics Volume 2. Brisbane: Australian Railway Historical Society. pp. 46/47. ISBN 9780909937263.
  2. ^ a b Turner, Jim (1997). Australian Steam Locomotives 1896-1958. Kenthurst: Kangaroo Press. p. 73. ISBN 086417778X.

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