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 | |
|---|---|
| Class | 806 - 1928 |
| Locobase ID | 15152 |
| Railroad | Tunisian State |
| Country | Tunisia |
| Whyte | 4-6-2 |
| Number in Class | 3 |
| Road Numbers | 231.806-231.808 |
| Gauge | Metre |
| Number Built | 3 |
| Builder | SACM |
| Year | 1928 |
| Valve Gear | Walschaert |
| 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 / 1180 |
| 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 Volume | 202.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4052 |
| Same as above plus superheater percentage | 4984 |
| Same as above but substitute firebox area for grate area | 20,229 |
| Power L1 | 13,955 |
| Power MT | 1162.92 |