Piraeus, Athens & Peloponnese Articulated Locomotives in Greece

Class Details by Steve Llanso of Sweat House Media

Class M801 (Locobase 1531)

According to [], edited by Nick Sharounis and John Zartaloodes, these were the first superheated locomotives in Greece.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID1531
RailroadPiraeus, Athens & Peloponnese (SPAP)
Number in Class3
Road NumbersM801-M803
Number Built3
BuilderKrauss Maffei
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)87,808 / 39,829
Engine Weight (lbs / kg)87,808 / 39,829
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)87,808 / 39,829
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.30 / 1100
Boiler Pressure (psi / kPa)174 / 12
High Pressure Cylinders (dia x stroke) (in / mm)13.4" x 21.3" / 340x541
Low Pressure Cylinders (dia x stroke) (in / mm)19.7" x 21.3" / 500x541
Tractive Effort (lbs / kg)17,863 / 8102.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.92
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)16.20 / 1.51
Evaporative Heating Surface (sq ft / m2)1147 / 106.60
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1147 / 106.60
Evaporative Heating Surface/Cylinder Volume329.91
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2819
Same as above plus superheater percentage2819
Same as above but substitute firebox area for grate area
Power L1
Power MT

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