Queensland PB15 class locomotive

Queensland Railways PB15 class
448 at Swanbank
Type and origin
Power type Steam
Designer Henry Horniblow & LW Piggott
Builder Evans, Anderson, Phelan & Co (70)
North Ipswich Railway Workshops (1)
Kitson & Co (20)
Toowoomba Foundry (20)
Walkers Limited (122)
Build date 1899-1926
Total produced 233
Specifications
Configuration:
 ​
 • Whyte 4-6-0
Gauge 1,067 mm (3 ft 6 in)
Leading dia. 2 ft 2 in (660 mm)
Driver dia. 4 ft 0 in (1,219 mm)
Length 47 ft 6 in (14.48 m)
Axle load 8.1 tonnes (8.0 long tons; 8.9 short tons)
Loco weight 32 tonnes (31.5 long tons; 35.3 short tons)
Tender weight 24 tonnes (23.62096 long tons; 26.45547 short tons)
Total weight 56 tonnes (55.115566 long tons; 61.729433 short tons)
Fuel type Coal
Fuel capacity 4 tonnes (3.9 long tons; 4.4 short tons)
Water cap 2,500 imperial gallons (11,000 l; 3,000 US gal)
Firebox:
 • Firegrate area		 12 sq ft (1.1 m2)
Boiler pressure 150 psi (1,034 kPa)
later upgraded to
160 psi (1,103 kPa)
Heating surface:
 • Tubes and flues		 780 sq ft (72 m2)
Cylinders 2 outside
Cylinder size 15 in × 20 in (381 mm × 508 mm)
Valve gear Stephenson (locos built 1899–1912)
Walschaerts (locos built 1924–26)
Performance figures
Maximum speed 65 km/h (40.39 mph)
Tractive effort 12,750 lbf (56.71 kN)
Career
Operators Queensland Railways
Numbers 347-362, 385-384, 404-413, 434-509, 518-537, 540-609, 12, 5, 103, 126, 128, 143, 220, 286, 339, 340, 731-751
Delivered 1899
First run 22/12/1899[1]
Last run 8/1970[2]
Retired 8/1970[3]
Withdrawn 8/1970[4]
Preserved 444, 448, 454, 732, 738
Current owner Various Heritage Groups
Disposition 5 preserved, 228 scrapped

The Queensland Railways PB15 class locomotive was a class of 4-6-0 steam locomotives operated by the Queensland Railways.

History

The design resulted from a need for more powerful engines for passenger trains. The PB15 Class was designed by Locomotive Engineer, Henry Horniblow and LW Piggott. Per Queensland Railway's classification system they were designated the PB15 class, P representing they were a passenger locomotive, the B that they had three driving axles and the 15 the cylinder diameter in inches. The PB15s were in essence identical to the B15 class.[5][6][7][8]

The first PB15 engines were delivered by Walkers Limited, Maryborough in December 1899. By 1912, a total of 202 had been built by Walkers (122), Evans, Anderson, Phelan & Co (70), Kitson & Co (20) and Toowoomba Foundry (20). They were fitted with Stephenson valve gear. In May 1918, no. 411 was converted at North Ipswich Railway Workshops into a tank engine, the one off member of the 6D15 class. In March 1922 however, due to poor performance it was converted back to its original tender form.[5][7]

In 1924 one example was built by North Ipswich Railway Workshops for the Aramac Shire Tramway. It was acquired by Queensland Railways in 1958.[5][7]

In 1925/26, Walkers manufactured a further 30 improved PB15 Class locomotives. These were fitted with larger tenders and Walschaerts valve gear. This earned this variant of the PB15 the nickname Walschaerts.[5][7]

In 1932, a number of PB15 class locomotives attached to Ipswich depot were fitted with a second sandbox for rear sanding to assist with shunting work on the colliery branches. These were nos. 351, 508, 567, 574, 587, 591, and 750, the last mentioned being a Walschaerts or 1924 type PB15. Later, the rear sanding equipment attached to No.591 was removed and PB15 No. 525 was fitted in lieu.

Preservation

Five examples have been preserved:

References

  1. ↑ http://www.qrig.org/motive-power/locomotives/steam/pb15-class
  2. ↑ http://www.qrig.org/motive-power/locomotives/steam/pb15-class
  3. ↑ http://www.qrig.org/motive-power/locomotives/steam/pb15-class
  4. ↑ http://www.qrig.org/motive-power/locomotives/steam/pb15-class
  5. 1 2 3 4 Armstrong, John (1994). Locomotives in the Tropics Volume 2. Brisbane: Australian Railway Historical Society. pp. 79–83, 102–106. ISBN 9780909937263.
  6. ↑ Turner, Jim (1997). Australian Steam Locomotives 1896-1958. Kenthurst: Kangaroo Press. pp. 21, 88. ISBN 086417778X.
  7. 1 2 3 4 Oberg, Leon (2010). Locomotives of Australia 1850s-2010. Dural: Rosenberg Publishing. pp. 106–108. ISBN 9781921719011.
  8. 1 2 Clark, Peter (2012). An Australian Locomotive Guide. Rosenberg Publishing. pp. 51/52. ISBN 9781921719554.
  9. ↑ PB15 No 448 Australian Steam
  10. ↑ http://www.qrig.org/motive-power/locomotives/steam/pb15-class
  11. ↑ PB15 No 448 Australian Steam
  12. ↑ Locomotives Bellarine Railway
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