SNCB 4-6-2 Locomotives in Belgium
Class Details by Steve Llanso of Sweat House Media
Class 1 (Locobase 2601)
Data from "La Construction des LOCOMOTIVES a VAPEUR en Belgique" (15 August 1938), monthly journal of La Federation des Constructeurs, hosted on [
] (last accessed 29 Sept 2007).
These large, semi-streamlined Pacifics were the largest and heaviest of that wheel arrangement built outside of North America. They had such large fireboxes that firemen used side-by-side firedoors. ACFI (Compagnie des Auxiliaires des Chemins de Fer et de l'Industrie) feedwater heaters, four 250-mm (9.84") diameter piston valves, and double Kylchap stack assemblies further improved this engine's efficiency. The valves and cylinders were cast in a single block.
At approximately 90 km/h (55 mph), dynamometer measurements showed the Type 1 putting out more than 2,500 hp. It could pull a 505-ton train up a 0.4% grade at 100 km/h (62 mph) and up a 1.6% grade at 70 km/h (43.5 mph).
NB: Belgian tube heating surface calculation reflected the interior diameters of the tubes and flues. Together with the firebox area, the result came to 234.78 sq m (2,526 sq ft). Calculating the tube heating surface from the outside diameters given in the data fiche yields the figure shown above.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 2601 |
| Railroad | SNCB |
| Country | Belgium |
| Whyte | 4-6-2 |
| Number in Class | 35 |
| Road Numbers | 101-135 |
| Gauge | Std |
| Number Built | 35 |
| Builder | CMI |
| Year | 1935 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.45 / 4.10 |
| Engine Wheelbase (ft / m) | 37.57 / 11.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.36 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 52,920 / 24,004 |
| Weight on Drivers (lbs / kg) | 158,733 / 72,000 |
| Engine Weight (lbs / kg) | 277,782 / 126,000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 10,499 / 39.77 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 88 / 44 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 78 / 1980 |
| Boiler Pressure (psi / kPa) | 255.30 / 1760 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.54" x 28.35" / 420x720 (4) |
| Tractive Effort (lbs / kg) | 43,155 / 19574.80 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.68 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 131 - 2.165" / 55 |
| Flues (number - dia) (in / mm) | 38 - 5.394" / 137 |
| Flue/Tube length (ft / m) | 19.69 / 6 |
| Firebox Area (sq ft / m2) | 212.27 / 19.72 |
| Grate Area (sq ft / m2) | 53.82 / 5 |
| Evaporative Heating Surface (sq ft / m2) | 2731 / 253.70 |
| Superheating Surface (sq ft / m2) | 1202 / 111.70 |
| Combined Heating Surface (sq ft / m2) | 3933 / 365.40 |
| Evaporative Heating Surface/Cylinder Volume | 193.68 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13,740 |
| Same as above plus superheater percentage | 18,000 |
| Same as above but substitute firebox area for grate area | 70,992 |
| Power L1 | 34,389 |
| Power MT | 1432.87 |