MENUMENU
MENUMENU

PB15 Class

Total Number of Engines Built 203
First Engine Built 1899
Last Engine Built 1924
First Engine Written Off 1941
Last Engine Written Off 1970
Number of Engines in Class on the Books as at:
31/12/00 31/12/10 31/12/20 31/12/30 31/12/40 31/12/50 31/12/60 31/12/66 31/12/67 31/12/68 31/12/69 31/12/70
16 132 202 202 202 170 161 118 100 67 25
Number of Engines in Class in Service as at:
31/12/67 31/12/68 7/10/69
65 34 20

Notes

This class was the most significant and successful of the locomotives designed in the nineteenth century. The design resulted from a need for more powerful engines for passenger trains. Initially designated as “Passenger” B15, they were later better known as PB15.

They spent many of their early years hauling important passenger trains around the state. With the strengthening of the main lines they were relieved of most of these tasks by more powerful locomotives. Later they were relegated to lesser duties on branch lines and in shunting yards. Engines attached to Wooloongabba and later at Mayne were used on “Southside” suburban passenger trains until 1968.

A number of modifications including cab alterations and fitting of electric headlights were carried out during their lives. Tenders on engines constructed at Toowoomba Foundry and the one at Ipswich had increased water capacity. Some engines based at Cairns had additional boards on their tenders to enable additional coal to be carried. Several engines were fitted with an additional sandbox and electric light on the tender for working on branch lines where no turning facilities were available. In May 1918, Ipswich Workshops converted N°411 into a tank engine. Evidently the results were not completely satisfactory as the engine returned to its original form in March 1922. In the late 1920s, the boiler pressure was increased from 150psi to 160 psi.

They could run on all parts of the system except the Etheridge line, the isolated Normanton and (now closed) Cooktown Lines.

One engine was built in 1924 for the Aramac Shire Council. This engine was subsequently purchased from the Council when the Aramac Shire Tramway was dieselized in 1958. Numbered A1 in Council service, it first ran on QR in February 1958 as N°1052 but was renumbered N°12 in June of that year. This was the only engine of the class to be constructed at Ipswich Workshops.

In 1924, increasing traffic on lines that could not carry C16 engines resulted in orders being placed for an engine of similar proportions but fitted with Walschaerts valve gear. These engines became PB15 (1924) Class.

In November 1969, nineteen members of the class were still operating; eleven in the Mackay District, and four at Maryborough and four at Ipswich.

*Originally 8 x 7½. The larger pumps were fitted between 1928 and 1942

Abbreviations

EAP – Evans, Anderson, Phelan & Co, Brisbane, Qld
Ipswich – Ipswich Workshops, Qld
Kitson – Kitson & Coy, Leeds, UK
Toowoomba – Toowoomba Foundry Ltd, (Southern Cross Works) Toowoomba, Qld
Walkers – Walkers Limited, Engineers, Maryborough, Qld

No images found in Gallery
Technical Details
 OriginalIncreased Boiler PressureEngines No. 590 No. 609 & No 12
Wheel Arrangement4-6-04-6-04-6-0
Cylinders (diameter x stroke) ins.15 X 2015 X 2015 X 20
Coupled Wheels diameter ins.484848
Rigid Wheel Base9' 9"9' 9"9' 9"
Height over smoke stack12' 0¼"12' 0¼"12' 0¼"
Axle Load7.97.97.9
Boiler Pressure - psi.150160150
Heating Surface - tubes792792792
Heating Surface - Total sq. ft.872872872
Grate Area - sq. ft.13.113.113.1
Weight - Adhesive23.923.923.9
Weight - Engine34.032.034.0
Weight - Tender24.2524.2528.1
Coal Capacity - tons444
Water Capacity - gallons180018002500
Tractive Effort - lbs. (85%)11250 (80%)12000 (80%)12000 (80%)
Factor of Adhesion4.764.464.46
Valve GearStephenson LinkStephenson LinkStephenson Link
Westinghouse Pump8 X 8½8 X 8½8 X 8½
Brake ValveNo4No4No4
Class Roster


Tags: , , , , , , , , , , , , , , , , , , , , , , , ,