South Australian Railways Q class

The South Australian Railways Q Class Locomotives were built by Dübs and Company and James Martin & Co for the South Australian Railways, they entered service in 1885 & 1892.[1]

South Australian Railways Q Class
South Australian Railways Q Class No. 86
Type and origin
Power typeSteam
BuilderDübs and Company
James Martin & Co
Serial number2030-2044 & 46-51
Build date1885-1892
Total produced22
Specifications
Configuration:
  Whyte4-4-0
  UIC2'B 3
Gauge5 ft 3 in (1,600 mm)
Leading dia.3 ft (914 mm)
Driver dia.5 ft 1 in (1,549 mm)
Length47 ft 2 14 in (14.383 m)
Height13 ft 3 in (4,038.6 mm)
Axle load11 tons 2 cwt
Total weight58 long tons 13 cwt (131,400 lb or 59.6 t)
Fuel typeCoal
Fuel capacity5 long tons 12 cwt (12,500 lb or 5.7 t)
Water cap2,040 imp gal (2,450 US gal; 9,300 L)
Firebox typeRound-top
  Firegrate area16.07 sq ft (1.493 m2)
Boiler pressure130 psi (900 kPa)
Heating surface:
  Tubes
1,032.7 sq ft (95.94 m2)
  Firebox89.2 sq ft (8.29 m2)
Cylinders2
Cylinder size16 12 in × 24 in (419 mm × 610 mm)
Valve gearStephenson
Valve typePiston
Performance figures
Tractive effort11,835 lbs
Factor of adh.4.16
Career
OperatorsSouth Australian Railways
ClassQ
Number in class22
Numbers76-90 & 108-114
First run10.4.1885
Last run1956
Withdrawn1923-1956
Scrapped1923-1956
Dispositionall scrapped

History

The first batch of fifteen Q class locomotives were purchased from Dübs and Company, Scotland to replace the unsuccessful N and O class locomotives on the South Australian Railways "Intercolonial" hills line workings. With the new Q class locomotives being able to haul moderate loads on offer, these locomotives performed very well and the S.A.R. ordered a second batch from the local James Martin & Co. Though following the introduction of the more powerful R class locomotives on the southern line the Q class was put to work on interstate trains. These interstate trains were from Murray Bridge to Serviceton and they also served the northern lines. These locomotives easily reached speeds of 60 mph (97 km/h) which was required to run these services. They were often seen "double heading" with the S class locomotives on express passenger trains. Q class locomotive No. 90 lingered on a long time after the demise of the rest of its class members. No. 90 worked local trains between Murray Bridge and Tailem Bend and in its final three years of life it spent its time as shunting locomotive at the Islington Railway Workshops.[2]

References

  1. Drynalik, Chris. "Broad Gauge Q-class 4-4-0 locomotives". Chris's Commonwealth Railways Information (ComRails). Retrieved 6 August 2019.
  2. FLUCK, R. E.; SAMPSON, R.; BIRD, K. J. (1986). STEAM LOCOMOTIVES AND RAILCARS OF THE SOUTH AUSTRALIAN RAILWAYS. South Australia: Mile End Railway Museum (S.A.) Inc. p. 67. ISBN 0959 5073 37.
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