Hellenic State 2-10-2 Locomotives in Greece

Class Details by Steve Llanso of Sweat House Media

Class M alpha (Locobase 1521)

Data from [], translated by Google. Breda and Ansaldo split the order, building ten locomotives each.

Huge engines used between Salonika and Athens for both passenger and freight service. As delivered, the locomotives presented enough problems that the Hellenic Railways had to contract with Henschel two years later for twenty new boilers suitable for oil firing. It's not clear when they were fitted with their Worthington 3 SAE feed water heaters.

Even so, Ziel and Eagleson (1973) observe that the contract with Breda and Ansaldo put the design of such large locomotives in the hands of builders who'd never attempted anything like this size before: "The result was predictable: the firebox was woefully inadequate and the big 2-10-2s were always short of steam.Their weight, already at the limit, precluded the necessary modifications that would have brought the engines up to full potential ...although some improvements were made."

The authors conclude that these engines lasted to the end of steam largely because no one would admit what a mistake they'd been.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassM alpha
Locobase ID1521
RailroadHellenic State
Number in Class20
Road NumbersIa1001-1020
Number Built20
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)17.03 / 5.19
Engine Wheelbase (ft / m)41.83 / 12.75
Ratio of driving wheelbase to overall engine wheelbase 0.41
Overall Wheelbase (engine & tender) (ft / m)71.26 / 21.72
Axle Loading (Maximum Weight per Axle) (lbs / kg)44,092 / 20,000
Weight on Drivers (lbs / kg)222,887 / 101,100
Engine Weight (lbs / kg)299,123 / 135,680
Tender Loaded Weight (lbs / kg)138,891 / 63,000
Total Engine and Tender Weight (lbs / kg)438,014 / 198,680
Tender Water Capacity (gals / ML)6600 / 25
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)13.20 / 12
Minimum weight of rail (calculated) (lb/yd / kg/m)74 / 37
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)261.10 / 18
High Pressure Cylinders (dia x stroke) (in / mm)25.98" x 29.53" / 660x750
Tractive Effort (lbs / kg)70,215 / 31849.03
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.17
Heating Ability
Tubes (number - dia) (in / mm) - 2.15" /
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)20.01 / 6.10
Firebox Area (sq ft / m2)263.72 / 24.50
Grate Area (sq ft / m2)60.28 / 5.60
Evaporative Heating Surface (sq ft / m2)3401 / 316
Superheating Surface (sq ft / m2)1378 / 128
Combined Heating Surface (sq ft / m2)4779 / 444
Evaporative Heating Surface/Cylinder Volume187.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15,739
Same as above plus superheater percentage20,303
Same as above but substitute firebox area for grate area88,826
Power L125,907
Power MT1281.26

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