Italian Army 2-6-2 Locomotives in Italy

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 15558)

Data from Dr. R. Sanzin, "Die Lokomotiven auf der Intertionalen Austellung in Mailand 1906, 51. 3/5 gekuppelte Tenderlokomotive der konigl. Italienischen Feldbahnen ...", Zeitschrift des Oesterreichischen Ingenieur- und Architeckten-Vereines, Volume LIX [59], Nr. 14 (5 April 1907), p 252.

Although the wheel arrangement might be described as a Prairie tank, this locomotive resembled no other such locomotives. Its boiler and firebox rested on a platform; the configuration of the vessel we'll get to in a moment. First comes the running gear, which had the adhesive axles inside the thick frame, the axle ends being extended to take the outside cranks for the valve gear and rods. The rear axle apparently did not swing, but traversed within a tight opening.

Above the platform and behind the firebox stood the crew, completely exposed to the elements. A second, shorter, smaller-diameter cylinder rested on the boiler. The regulator was perched on the top of this receiver and a long pipe extended down to a point near the cylinder.

Given that this was a light railway locomotive for the Army, Locobase suspects that it operated on very light track.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15558
RailroadItalian Army
Number in Class
Road Numbers
Gauge75 cm
Number Built
BuilderGA Armstrong
Valve GearHeusinger
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)
Engine Weight (lbs / kg)39,242 / 17,800
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)39,242 / 17,800
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)25.60 / 650
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)12.99" x 15.75" / 330x400
Tractive Effort (lbs / kg)19,202 / 8709.89
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)118 - 1.85" / 47
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 8.61 / 0.80
Evaporative Heating Surface (sq ft / m2)501 / 46.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)501 / 46.50
Evaporative Heating Surface/Cylinder Volume207.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1874
Same as above plus superheater percentage1874
Same as above but substitute firebox area for grate area
Power L1
Power MT

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