The South Australian Railways K class (narrow gauge) comprised a single locomotive. The design, by South Australian Railways Locomotive Engineer William Thow, was very similar to that of the broad-gauge K class, but it was smaller and lighter. It was allocated number 52 within the sequence allocated to the larger locomotives.
Class of South Australian narrow-gauge steam locomotive closely related to the broad-gauge K class
South Australian Railways K class (narrow-gauge version)
Sole representative of its class on the narrow gauge, South Australian Railways K class no. 52 at Peterborough
Type and origin
Power type
Steam
Designer
William Thow
Builder
Dübs and Company
Build date
1883
Total produced
1
Specifications
Configuration:
•Whyte
0-6-4T
•UIC
C2' T
Gauge
3ft6in (1067mm)
Driver dia.
3ft 6in (1067mm)
Trailing dia.
2ft 3in (686mm)
Wheelbase
9ft 0in (2743mm)
Wheel spacing (Asymmetrical)
5ft 4+1⁄2in (1638mm) + 3ft 7+1⁄2in (1105mm)
Length:
•Over beams
28ft 3in (8611mm)
Height
11ft 6in (3505mm)
Axle load
20long tons0cwt (44,800lb or 20.3t)
•1st coupled
6long tons11cwt (14,700lb or 6.7t)
•2nd coupled
6long tons16.8cwt (15,300lb or 6.9t)
•3rd coupled
6long tons16.8cwt (15,300lb or 6.9t)
•Trailing
11long tons0cwt (24,600lb or 11.2t)
Loco weight
32long tons12cwt (73,000lb or 33.1t)
Fuel type
Coal
Fuel capacity
1long ton2cwt3qr (2,550lb or 1.16t)
Water cap.
940impgal (1130USgal; 4300L)
Firebox type
Round-top
•Firegrate area
13.14sqft (1.221m2)
Boiler:
•Pitch
5ft 8in (1730mm)
Boiler pressure
130psi (900kPa)
Safety valve
Salter spring balance, probably Ramsbottom later
Heating surface: •Tubes
699.5sqft (64.99m2)
•Firebox
77.9sqft (7.24m2)
Cylinders
2
Cylinder size
14+1⁄2in ×20in (368mm ×508mm)
Valve gear
Inside
Performance figures
Tractive effort
11,063lbf (49.21kN)
Career
Operators
South Australian Railways
Class
K (narrow gauge)
Number in class
1
Numbers
52
First run
25 January 1884
Withdrawn
24 May 1938
Disposition
Scrapped
The locomotive was built in 1883, five years after the first broad-gauge K class locomotive and a year before the last of the 18 such locomotives entered service. No.52 was built by Dübs and Company of Glasgow, whereas Beyer, Peacock and Company, of Manchester, built all the broad-gauge class.[1][2]
The broad-gauge design was moderately "shrunk" to meet the smaller loading gauge of 3ft6in (1067mm) lines and the lower load-bearing capacity of track compared with the 5ft3in (1600mm) broad gauge.[3][4][1] Some key specifications are compared in the table below.
Some differences between the two types of Kclasslocomotives
Specification
Narrow-gauge K
Broad-gauge K
Narrow/ broad proportion
Length over buffer beams
28ft 3in (8611mm)
30ft 0in (9144mm)
94%
Driving wheels diameter
3ft 6in (1067mm)
4ft 0in (1219mm)
88%
Loco weight
32long tons12cwt (73,000lb or 33.1t)
42long tons19cwt (96,200lb or 43.6t)
76%
Heating surface (firebox + tubes)
699.5sqft (64.99m2)
920.2sqft (85.49m2)
76%
Tractive effort
11,063lbf (49.21kN)
12,535lbf (55.76kN)
88%
A major design weakness of the broad-gauge K class was the lack of a leading bogie (pilot truck), which led to frequent derailments, especially on sharp curves and difficult gradients. A partial solution was to run the locomotives in reverse – i.e., with cab leading – so that the rear bogie led, providing guidance for the driving wheels.[3] The extent to which the weakness affected no.52 is not known, although the presence of a stopcock on both ends of the locomotive – to take water from a four-wheeled tank wagon on longer journeys – indicates that it was able to be operated both funnel-first and cab-first.
Little is known about the service life of the locomotive; it is believed to have spent most of its half-century existence at Peterborough as a shunting engine.[1]
Fluck, Ronald E.; Sampson, Robert; Bird, Kim J. (1986). Steam locomotives and railcars of the South Australian Railways. Adelaide, South Australia: Mile End Railway Museum (S.A.) Inc. ISBN0959507337.
Williams, Hugh (2008). "The broad gauge K class locomotives of the South Australian Railways". Proceedings of the 2008 convention. Modelling the Railways of South Australia. Adelaide. p.159.
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