Queensland B18¼ class locomotive

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
Gauge	1,067 mm (3 ft 6 in)
Driver dia.	4 ft 3 in (1,295 mm)
Loco weight	56.3 long tons (63.1 short tons; 57.2 t)
Tender weight	36.9 long tons (41.3 short tons; 37.5 t)
Fuel type	Coal
Fuel capacity	8 long tons (9.0 short tons; 8.1 t)
Water cap.	3,000 imp gal (14,000 L; 3,600 US gal)
Firebox:
• Grate area	25 sq ft (2.3 m2)
Boiler pressure	170 lbf/in2 (1,172 kPa)
Heating surface:
• Tubes	1,511 sq ft (140.4 m2) (as built); 1,478 sq ft (137.3 m2) (1935 reboilering); 1,414 sq ft (131.4 m2) (1936 reboilering)
• Total surface	1,957 sq ft (181.8 m2) (as built); 1,923 sq ft (178.7 m2) (1935 reboilering); 1,859 sq ft (172.7 m2) (1936 reboilering)
Cylinders	2 outside
Cylinder size	18.25 in × 24 in (464 mm × 610 mm)
Valve gear	Walschaerts

Type and origin
Type and origin
Power type	Steam
Builder	North Ipswich Railway Workshops (59) ; Walkers Limited (24)
Build date	1926-1947
Total produced	83

Queensland Railways B18¼ class
Queensland Railways B18¼ class
	230
Power type
Type and origin
Power type	Steam
Builder	North Ipswich Railway Workshops (59) ; Walkers Limited (24)
Build date	1926-1947
Total produced	83
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
Gauge	1,067 mm (3 ft 6 in)
Driver dia.	4 ft 3 in (1,295 mm)
Loco weight	56.3 long tons (63.1 short tons; 57.2 t)
Tender weight	36.9 long tons (41.3 short tons; 37.5 t)
Fuel type	Coal
Fuel capacity	8 long tons (9.0 short tons; 8.1 t)
Water cap.	3,000 imp gal (14,000 L; 3,600 US gal)
Firebox:
• Grate area	25 sq ft (2.3 m2)
Boiler pressure	170 lbf/in2 (1,172 kPa)
Heating surface:
• Tubes	1,511 sq ft (140.4 m2) (as built); 1,478 sq ft (137.3 m2) (1935 reboilering); 1,414 sq ft (131.4 m2) (1936 reboilering)
• Total surface	1,957 sq ft (181.8 m2) (as built); 1,923 sq ft (178.7 m2) (1935 reboilering); 1,859 sq ft (172.7 m2) (1936 reboilering)
Cylinders	2 outside
Cylinder size	18.25 in × 24 in (464 mm × 610 mm)
Valve gear	Walschaerts
Maximum speed
Performance figures
Maximum speed	50 mph (80 km/h)
Tractive effort	22,648 lbf (100.7 kN)
Factor of adh.	3.54
Operators
Career
Operators	Queensland Railways
Numbers	16, 18, 28, 30, 40, 52, 84, 227-232, 768-771, 827-830, 841-852, 864-881, 887-916
Preserved	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.

History

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]

Preservation

771 has been preserved at the Workshops Rail Museum.^[3]

References

^ ^a ^b Armstrong, John (1994). Locomotives in the Tropics Volume 2. Brisbane: Australian Railway Historical Society. pp. 86–96. ISBN 9780909937263.
^ ^a ^b Turner, Jim (1997). Australian Steam Locomotives 1896-1958. Kenthurst: Kangaroo Press. p. 113. ISBN 086417778X.
^ ^a ^b ^c Oberg, Leon (2010). Locomotives of Australia 1850s-2010. Dural: Rosenberg Publishing. p. 196. ISBN 9781921719011.

External links

Media related to Queensland B18¼ class locomotives at Wikimedia Commons

[Armstrong-1] Armstrong, John (1994). Locomotives in the Tropics Volume 2. Brisbane: Australian Railway Historical Society. pp. 86–96. ISBN 9780909937263.

[Turner-2] Turner, Jim (1997). Australian Steam Locomotives 1896-1958. Kenthurst: Kangaroo Press. p. 113. ISBN 086417778X.

[Oberg-3] Oberg, Leon (2010). Locomotives of Australia 1850s-2010. Dural: Rosenberg Publishing. p. 196. ISBN 9781921719011.

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