Victorian Railways AA class

This article is about the 1900 AA class steam locomotives. For the 1884 'Old' A class steam locomotives, see Victorian Railways 'Old' A class (1884). For the 1889 'New' A class steam locomotives, see Victorian Railways 'New' A class (1889). For the 1907 A2 class steam locomotive, see Victorian Railways A2 class. For the 1984 A class diesel locomotives, see V/Line A class.

Victorian Railways AA Class
Type and origin
Power typesteam
DesignerEugene Siepen
BuilderPhoenix Foundry, Ballarat
Build date1900–1903
Specifications
Configuration:
​
 • Whyte4-4-0
 • UIC2'Bh2
Gauge5 ft 3 in (1,600 mm)
Driver dia.6 ft 1 in (1.854 m)
Adhesive weight32 long tons (33 t; 36 short tons) (roadworthy)
Tender weight41.2 long tons (41.9 t; 46.1 short tons)
Total weight91.1 long tons (92.6 t; 102.0 short tons)
Firebox:​
 • Grate area23 sq ft (2.1 m2)
Boiler pressure200 psi (1,379 kPa)
Heating surface1,439 sq ft (133.7 m2)
CylindersTwo, inside
Cylinder size19 in × 26 in (483 mm × 660 mm)
Valve gearStephenson
Valve typepiston valves
Performance figures
Tractive effort20,850 lbf (92.75 kN) at 80% WP MEP
Career
First run1900
Last run1932
DispositionAll scrapped

The AA class was an express passenger locomotive that ran on the Victorian Railways between 1900 and 1932. The largest, heaviest and most powerful 4-4-0 steam locomotive to run in Australia, it was the final development of this locomotive type in Australia.[1]

  1. ^ Cave, Norman; Buckland, John; Beardsell, David (2002). Steam locomotives of the Victorian Railways. Volume 1, The first fifty years. Melbourne: Australian Railway Historical Society, Victorian Division. p. 177. ISBN 1876677384.