Queensland PB15 class locomotive
|Queensland PB15 class|
PB15 No. 448 at Swanbank
|Designer||Henry Horniblow and L. W. Piggott.|
|Builder||Evans, Anderson, Phelan & Co. (70,)
Ipswich workshops (1),
Kitson & Co. (20),
Toowoomba Foundry (20), Walkers Limited (122)
|UIC classification||2′C n2|
|Gauge||3 ft 6 in (1,067 mm)|
|26 in (660.40 mm)|
|Driver diameter||48 in (1,219.20 mm)|
|Length||47 ft 6 in (14.48 m)|
|Axle load||8.1 tonnes (8.0 long tons; 8.9 short tons)|
|Locomotive weight||32 tonnes (31.5 long tons; 35.3 short tons)|
|Tender weight||24 tonnes (23.62096 long tons; 26.45547 short tons)|
|Locomotive and tender
|56 tonnes (55.115566 long tons; 61.729433 short tons)|
|Fuel type||Coal, Water|
|Fuel capacity||4 tonnes (3.9 long tons; 4.4 short tons)|
|Water capacity||2,500 imperial gallons (11,000 l; 3,000 US gal)|
|Boiler pressure||150 psi (1.03 MPa), later upgraded to 160 psi (1.10 MPa)|
|Firegrate area||12 sq ft (1.1 m2)|
Tubes and flues
|780 sq ft (72 m2)|
|Cylinder size||15 × 20 in (381 × 508 mm)|
|Valve gear||Stephenson (locos built 1899–1912)
Walschaerts (locos built 1924–26)
|Tractive effort||12,750 lbf (56.71 kN)|
|Number||347–362, 385–384, 404–413, 434–509, 518–537, 540–609, 12, 5, 103, 126, 128, 143, 220, 286, 339, 340, 731–751|
|Nicknames||Walschaerts (Walschaert variants only)|
|Preserved||444, 448, 454, 732, 738|
|Disposition||Five preserved, remainder scrapped|
The design resulted from a need for more powerful engines for passenger trains. The PB15 Class was designed by Locomotive Engineer, Henry Horniblow and L. W. Piggott. The “P”, which was used to denote “Passenger”, was added to the classification of the new locomotives to distinguish them from the earlier B15 Class, which were primarily goods engines. The “B”, is used to identify the number of coupled wheels, being six coupled wheels for the PB15 class, followed by numerals indicating the cylinder diameter of fifteen inches. The PB15s were in essence identical to the B15s.
The first PB15 engines were delivered by Walkers Ltd, Maryborough in April 1900. The original locomotives delivered between 1900 and 1912 were fitted with Stephensons Valve Gear. Walkers Ltd manufactured a further 30 improved PB15 Class locomotives between 1924 and 1926 and these were fitted with Walschaerts Valve Gear. This earned this variant of the PB15 the nickname Walschaerts. At the height of their service there were approximately 230 locomotives in service in Queensland. Additionally, in May 1918, No. 411 was converted at Ipswich 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.
Five have been preserved:
- No. 444 is on display at the Workshops Rail Museum, in Ipswich, Queensland.
- No. 448 is operational on the Queensland Pioneer Steam Railway, Swanbank, Queensland, and has been named in preservation "R. V. Armstrong", after the society's late founding member.
- No. 454 is undergoing a major overhaul at the Bellarine Peninsula Railway, Queenscliff, Victoria.
- No. 732 is in storage at the QR Heritage Fleet's Ipswich Railway Workshops, Ipswich, Queensland. One of the 1924 Walschaerts.
- No. 738 is on display at the Rosewood Railway Museum, Rosewood, Queensland. One of the 1924 Walschaerts.
- "PB15 Class « qrig.org – queensland railway's interest group". Queensland Rail Intrest Group. Retrieved 31 October 2013.
|Wikimedia Commons has media related to Queensland PB15 class locomotives.|