New South Wales Gov. Rly Beyer-Garratt Locomotives in Australia

Class Details by Steve Llanso of Sweat House Media

Class AD60 (Locobase 542)

Data from builder's card forwarded to Locobase 21 July 2023 by Alexander Blessing, used with thanks; and 2 Jan 1961 publicity handout from the NSWGR reproduced at [] See also []; and O S Nock, Railways in the Transition from Steam-1940-1965 (NY: Macmillan, 1974-originally London: Blandford Press), pl 40 and p.108. (Thanks to Alexander Blessing for his 11 July 2023 email supplying the builder's card and noting some differences in the specs.). Works numbers were 7473-7497 in 1952, 7528-7539 in 1953-1954, 7540-7549 in 1956.

First Beyer-Garratts to have a cast-steel engine bed; each of the two weighed 13 tons and all 84 castings came from General Steel Castings Corporation of the United States. Firebox had arch tubes or thermic syphons. Self-cleaning smokebox, rocker grate, mechanical stoker, SKF double-row, self-aligning roller bearings. Known as "Big-Boy" Garratts because of the double Northern wheel arrangement.

When first put in service the design had 19 1/4" (489 mm)-diameter cylinders -- tractive effort was 59,560 lb. 30 were later fitted with dual control and had 19 7/8" x 26" cylinders as shown in the specs. Piston valves measuring 10" (254 mm) in diameter admitted steam to each of 4 cylinders.

According to the [] (consulted July 2002), website of the then-owner of 6029, an AD60 burned 37 kg (82 lb) of coal each minute when pressed and evaporated 430 liters (114 US gal) of water. The site also notes that these locomotives filled the loading gauge to its last inch. They were not allowed in single-line tunnels because a breakdown would trap the crew, which wouldn't be able to squeeze through the 20-cm (8") gap between locomotive and tunnel wall.

Originally operated on the Sydney main lines until these were electrified, later on the Cowan bank.

Beyer, Peacock delivered two more batches in 1952 -- 7528-7544 and 7545-7549. According to Nock, this class were among the last steam locomotives to operate in New South Wales. On 2 March 1973, #6042 made the last run of any steam locomotive in revenue service in New South Wales.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID542
RailroadNew South Wales Gov. Rly
Number in Class42
Road Numbers6001-6042
Number Built42
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)29.50 / 8.99
Engine Wheelbase (ft / m)75 / 22.86
Ratio of driving wheelbase to overall engine wheelbase 0.39
Overall Wheelbase (engine & tender) (ft / m)97.67 / 29.77
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,840 / 16,257
Weight on Drivers (lbs / kg)286,227 / 129,831
Engine Weight (lbs / kg)570,920 / 258,965
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)570,920 / 258,965
Tender Water Capacity (gals / ML)11,040 / 41.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)20 / 18.20
Minimum weight of rail (calculated) (lb/yd / kg/m)60 / 30
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 1397
Boiler Pressure (psi / kPa)204.50 / 14.10
High Pressure Cylinders (dia x stroke) (in / mm)19.88" x 26" / 505x660 (4)
Tractive Effort (lbs / kg)64,951 / 29461.31
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Tubes (number - dia) (in / mm)258 - 2" / 51
Flues (number - dia) (in / mm)50 - 5.5" / 140
Flue/Tube length (ft / m)13.54 / 4.13
Firebox Area (sq ft / m2)238 / 22.11
Grate Area (sq ft / m2)63.50 / 5.90
Evaporative Heating Surface (sq ft / m2)3030 / 281.50
Superheating Surface (sq ft / m2)750 / 69.68
Combined Heating Surface (sq ft / m2)3780 / 351.18
Evaporative Heating Surface/Cylinder Volume162.19
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,986
Same as above plus superheater percentage15,583
Same as above but substitute firebox area for grate area58,405
Power L111,008
Power MT678.30

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