Data from Railway Engineer (April 1905), p. 107; see also Institution of Mechanical Engineers (March 1904), p. 362 and A Herdner, "The Compound Locomotive and its Development in France", American Engineer and Railroad Journal, Volume 77, No.1 (January 1903), p. 7.
This was of the biggest Consolidations built for a European railway during the period.
The RE author notes the oddity of disparate lengths of connecting (US: main) rods. The HP rods measured 6' 2" (1.9 m) and the LP rods 9' 10" (3 m), "but as the engine is only intended for low speeds, this is not a harmful feature".
HP valves were driven by Stephenson's link motion inside, while the outside LP cylinders had valves acutated by Walschaert radial valve gear. And another valve, located between and above the HP cylinders, was operated by a compressed-air cylinder to select full compound, semi-compound, and simple-expansion operation.
Like many French locomotives of the era, this class had Serve boiler tubes with internal fins. It also used a Belpaire firebox. Herdner reports on the results of early operation: "These locomotives haul trains of 220 tons on 3.3 per cent, grades on the Beziers to Neussargues division with an equivalent kilometric consumption of steam and of slightly inferior kilometric consumption of coal than our older 8-wheel coupled locomotives, single expansion, and which cannot haul more than 159.8 tons on the same grades."
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4001 |
| Locobase ID | 9420 |
| Railroad | Sud |
| Country | France |
| Whyte | 2-8-0 |
| Number in Class | 2 |
| Road Numbers | 4001-4002 |
| Gauge | Std |
| Number Built | 2 |
| Builder | |
| Year | 1904 |
| Valve Gear | Steph/Walsch |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16.08 / 4.90 |
| Engine Wheelbase (ft / m) | 23.13 / 7.05 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.70 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 35,587 / 16,142 |
| Weight on Drivers (lbs / kg) | 142,352 / 64,570 |
| Engine Weight (lbs / kg) | 157,809 / 71,581 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 59 / 29.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 55.10 / 1400 |
| Boiler Pressure (psi / kPa) | 213.20 / 1470 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15.35" x 26.38" / 390x670 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 23.62" x 26.38" / 600x670 |
| Tractive Effort (lbs / kg) | 28,746 / 13038.98 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.95 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 148 - 2.756" / 70 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.11 / 4.30 |
| Firebox Area (sq ft / m2) | 170.83 / 15.88 |
| Grate Area (sq ft / m2) | 30.14 / 2.80 |
| Evaporative Heating Surface (sq ft / m2) | 2757 / 256.23 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2757 / 256.23 |
| Evaporative Heating Surface/Cylinder Volume | 487.94 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6426 |
| Same as above plus superheater percentage | 6426 |
| Same as above but substitute firebox area for grate area | 36,421 |
| Power L1 | 5285 |
| Power MT | 327.40 |