Tunisian State 4-6-2 Locomotives in Tunisia


Class Details by Steve Llanso of Sweat House Media

Class 806 - 1928 (Locobase 15152)

Data from SACM diagram Elsassische Maschinenbau AG from locomotive book supplied by Dany Machi up at [] as

Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007). Works numbers were 6584-6588.

Water-side diameters were 50 mm for the tubes, 133 mm for the flues, which yielded an evaporative heating surface area of 1,583 sq ft (147.05 sq m).

See Locobase 15152 for the first five locomotives of this class. Although they were built fourteen years apart, the one big difference bewteen the two batches was the exchange of 12 small tubes for three more flues with superheater elements in them. This raised the superheater ratio at the expense of combined heating surface area.

Principal Dimensions by Steve Llanso of Middle Run Media

Class806 - 1928
Locobase ID15152
RailroadTunisian State
CountryTunisia
Whyte4-6-2
Number in Class3
Road Numbers231.806-231.808
GaugeMetre
Number Built3
BuilderSACM
Year1928
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.50 / 3.20
Engine Wheelbase (ft / m)28.22 / 8.60
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)40.35 / 12.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,683 / 18,000
Weight on Drivers (lbs / kg)79,366 / 36,000
Engine Weight (lbs / kg)127,647 / 57,900
Tender Loaded Weight (lbs / kg)70,658 / 32,050
Total Engine and Tender Weight (lbs / kg)198,305 / 89,950
Tender Water Capacity (gals / ML)3960 / 15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.30 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)59.10 / 1501
Boiler Pressure (psi / kPa)171.10 / 11.80
High Pressure Cylinders (dia x stroke) (in / mm)18.11" x 24.02" / 460x610
Tractive Effort (lbs / kg)19,386 / 8793.35
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09
Heating Ability
Tubes (number - dia) (in / mm)120 - 1.772" / 45
Flues (number - dia) (in / mm)21 - 4.921" / 125
Flue/Tube length (ft / m)16.40 / 5
Firebox Area (sq ft / m2)96.12 / 8.93
Grate Area (sq ft / m2)23.68 / 2.20
Evaporative Heating Surface (sq ft / m2)1453 / 134.98
Superheating Surface (sq ft / m2)444 / 41.23
Combined Heating Surface (sq ft / m2)1897 / 176.21
Evaporative Heating Surface/Cylinder Volume202.90
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4052
Same as above plus superheater percentage4984
Same as above but substitute firebox area for grate area20,229
Power L113,955
Power MT1162.92

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