Victorian Government Rlys 4-4-0 Locomotives in Australia


Class Details by Steve Llanso of Sweat House Media

Class AA (Locobase 10649)

Data from diagram held in Victoria State Public Records Office and available on line at [], last accessed 12 July 2009 and Wikipedia's entry on the AA class, []

This class was made up of the largest 4-4-0s to operate in Victoria, in large part because their axle loadings reached the maximum for the relatively light rail on which they rode. The first 10 were delivered in 1900 with three-axle tenders and 185-psi boilers; the 10 produced in 1903 had 200-psi boilers and bigger tenders riding on 2 bogie trucks.

Their immediate service area was the mainline expresses, but the growing weight of the trailing load, coupled with the AA's low factor of adhesion, led to the development of the A2 4-6-0, which replaced the AAs in service on those runs.

The class continued to be useful in a variety of duties and 4 -- 542, 544, 566, and 570 -- were given Robinson superheaters and had their boiler pressure reduced to 175 psi.

The non-superheated engines began leaving service in 1919; they were all gone by 1926. Wikipedia notes that a number of these retired boilers were later used in river boats. The 4 superheated AAs were all withdrawn by 1932.


Class D (Locobase 9551)

Data from Howell, Comparative Statistics of the Australasian Railways, Journal of the Royal Statistical Society, March 1899, pp. 94-95. Road numbers included 82, 92, 122, 242, 244, 248, 250, 260, 322-344 (even only).

Built at the same time as the "New As" (Locobase 2341) and by the same shop, these were also passenger 4-4-0s, but of smaller dimensions and drivers.


Class G (Locobase 10648)

Data from diagram held in Victoria State Public Records Office and available on line at [], last accessed 12 July 2009.

Locobase can't identify this locomotive - for that matter, he can't firmly establish either the cylinder dimensions or the driver diameters.


Class New A (Locobase 2431)

Data from Howell, Comparative Statistics of the Australasian Railways, Journal of the Royal Statistical Society, March 1899, pp. 94-95.

These "New As" were built on the same boiler as the more numerous Y class (Locobase 2395) and substantially taller drivers. They served the Victorian until 1925, by which time they had been refitted with boilers offering a heating surface of 1,424 sq ft.


Class Old A (Locobase 1104)

Data from "Drawing of Old A Class Steam Locomotive," Public Records of Victoria, [], last accessed 30 August 2009. Works numbers were 2344-2353.

Ten built, based on New South Wales' Peacock Highflyers (Locobase 1105).

Principal Dimensions by Steve Llanso of Sweat House Media

ClassAADGNew AOld A
Locobase ID10649 9551 10648 2431 1104
RailroadVictorian Government RlysVictorian Government RlysVictorian Government RlysVictorian Government RlysVictorian Government Rlys
CountryAustraliaAustraliaAustraliaAustraliaAustralia
Whyte4-4-04-4-04-4-04-4-04-4-0
Number in Class202021510
Road Numbers530-570 (even)146-160394-424 (even only)130-138, 200-208 (even only)
Gauge5'3"5'3"5'3"5'3"5'3"
Number Built202021510
BuilderPhoenix FoundryPhoenix FoundryshopsPhoenix FoundryBeyer, Peacock
Year19001887187718891884
Valve GearStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.42 / 2.57 7.337 / 2.138 / 2.44
Engine Wheelbase (ft / m)23.58 / 7.1917.75 / 5.41
Ratio of driving wheelbase to overall engine wheelbase 0.36 0.45
Overall Wheelbase (engine & tender) (ft / m)45.75 / 13.9434.34 / 10.4749.79 / 15.18
Axle Loading (Maximum Weight per Axle) (lbs / kg)37,744 / 17,12030,46421,056 / 955133,040 / 14,987
Weight on Drivers (lbs / kg)74,816 / 33,93660,92841,412 / 18,78463,952 / 29,00863,280 / 28,703
Engine Weight (lbs / kg)111,776 / 50,70196,76869,832 / 31,67596,320 / 43,690100,464 / 45,570
Tender Loaded Weight (lbs / kg)92,288 / 41,86167,59246,452 / 21,07067,200 / 30,48164,960 / 29,465
Total Engine and Tender Weight (lbs / kg)204,064 / 92,562164,360116,284 / 52,745163,520 / 74,171165,424 / 75,035
Tender Water Capacity (gals / ML)5280 / 2026402040 / 7.732640 / 103216 / 12.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 5.50 / 5 3.80 3.30 / 3 3.90 / 4 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)62 / 3151 / 25.5035 / 17.5053 / 26.5053 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73 / 185460 / 182960 / 152472 / 182972 / 1829
Boiler Pressure (psi / kPa)200 / 13.80140 / 10.50130 / 9140 / 9.70175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x66017" x 26" / 457x66015" x 22" / 381x55918" x 26" / 457x66018" x 26" / 457x660
Tractive Effort (lbs / kg)21,858 / 9914.6314,903 / 6759.909116 / 4134.9513,923 / 6315.3717,404 / 7894.33
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.42 4.09 4.54 4.59 3.64
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)101.80 / 9.46101.8082.40 / 7.6695 / 8.83101 / 9.39
Grate Area (sq ft / m2)23 / 2.142113.95 / 1.3021 / 1.9521 / 1.95
Evaporative Heating Surface (sq ft / m2)1434 / 133.271434 / 133.36977 / 90.801151 / 106.971435 / 133.36
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1434 / 133.271434 / 133.36977 / 90.801151 / 106.971435 / 133.36
Evaporative Heating Surface/Cylinder Volume168.07209.94217.13150.31187.39
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation46002940181429403675
Same as above plus superheater percentage46002940181429403675
Same as above but substitute firebox area for grate area20,36014,25210,71213,30017,675
Power L155413982401335675320
Power MT326.56288.17427.27245.93370.69

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