New South Wales 2-6-4 Locomotives in Australia

Class Details by Steve Llanso of Sweat House Media

Class A/E, E-10/Z20 (Locobase 2404)

Data from [], last accessed 4 December 2011. See also the New South Wales Rail Transport Museum website at [], and John Forsythe (Archive Officer, Transport House), Steam Locomotive Data, Public Transport Commission of NSW [New South Wales], July 1974, p. 75, archived at [], last accessed 12 March 2015. (Many thanks to Brett Fitzpatrick for his 11 March 2015 email supplying the link to the CoalsToNewcastle website.)

One of two wheel arrangements on the same boiler, the other (Z19) being an 0-6-0 tender engine (Locobase 2403). The first of the E 10s were ordered in 1890 to bolster coal-traffic movement in Newcastle (a good example of the limitations in the old expression about redundant activity). Beyer Peacock shipped ten while Henry Vale built two more in Australia.

Like the A(93)s, these had Belpaire fireboxes and many of the engine's components were designed to be interchangeable with the all-adhesion six-coupleds. But adopting a Bissel truck meant that the unusually wide spacing between the first two axles could be reduced by 10 inches (254 mm) by moving the first driven axle that much farther back.

The engines were as useful as their A(93) kin and prompted conversions of six A(93)s in 1902 (as A/E) and eight more in 1908-1910. NSW shops turned out seven new engines to the same design in 1911.

As coal traffic demanded still more pull from its motive power, these tanks were eventually relegated to branch-line traffic over lightly built rails and around tight curves. According to the NSWRTM, these suburban passenger lines included Carlingford, Camden, Kurrajong and Morpeth.

According to [], some of these were converted to tender engines after 1924, but doesn't say what the arrangement was.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassA/E, E-10/Z20
Locobase ID2404
RailroadNew South Wales
Number in Class33
Road Numbers2001-2033
Number Built21
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.25 / 3.43
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)38.02 / 11.59
Axle Loading (Maximum Weight per Axle) (lbs / kg)29,568 / 13,412
Weight on Drivers (lbs / kg)83,664 / 37,949
Engine Weight (lbs / kg)137,648 / 62,436
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)137,648 / 62,436
Tender Water Capacity (gals / ML)1800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.20 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)46 / 23
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48.50 / 1232
Boiler Pressure (psi / kPa)152.30 / 10.50
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)20,756 / 9414.77
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.03
Heating Ability
Tubes (number - dia) (in / mm)199 - 1.875" / 0
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.33
Firebox Area (sq ft / m2)90.40 / 8.40
Grate Area (sq ft / m2)17.90 / 1.66
Evaporative Heating Surface (sq ft / m2)1322 / 122.86
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1322 / 122.86
Evaporative Heating Surface/Cylinder Volume187.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2726
Same as above plus superheater percentage2726
Same as above but substitute firebox area for grate area13,768
Power L13090
Power MT244.27

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Wes Barris