Paris-Lyon-Mediterrannee 0-10-0 Locomotives in France
Class Details by Steve Llanso of Sweat House Media
Class 050 A (Locobase 9999)
Data from US Military Railway Service Equipment Data Book for French Locomotives supplied by Allen Stanley in March 2004 from his extensive Rail Data Exchange. See also the PLM Wiki at [
], last accessed 4 November 2011.
For some time, Locobase could not pin this design down. It was not a version of the ubiquitous G 10 that came to several French railroads to satisfy World War I reparation demands. See Locobase 1283 for the G10 entry to compare. Rather, he thought, it seemed to have originated on the PLM (that railway's 050 B class consisted of war-reparations G10s).
The PLM Wiki provided the answer: this batch of 50 locomotives were war reparations, but from Austria-Hungary and were based on the latters Class 80 design. They had 250-mm (9.8-in) diameter piston valves over cylinders raked at 8 deg 8 min from the horizontal. The long piston rod and main rod drove on the 4th axle.
PLM's 1925 diagram gives the evaporative heating surface figure shown in the specifications. But Austrian entries show that value as 190 sq m (2,048 sq ft), even though the calculated areas for boilers holding the given number of tubes and flues of the given length with outside diameters as shown is as given in the PLM diagram.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 050 A |
| Locobase ID | 9999 |
| Railroad | Paris-Lyon-Mediterrannee (PLM) |
| Country | France |
| Whyte | 0-10-0 |
| Number in Class | 50 |
| Road Numbers | A 1 - A 50 |
| Gauge | Std |
| Number Built | 50 |
| Builder | Austrian State Railways |
| Year | 1921 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 18.37 / 5.60 |
| Engine Wheelbase (ft / m) | 18.37 / 5.60 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 29,784 / 13,510 |
| Weight on Drivers (lbs / kg) | 147,401 / 66,860 |
| Engine Weight (lbs / kg) | 134,173 / 60,860 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 4227 / 16.01 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 7.70 / 7 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51.10 / 1299 |
| Boiler Pressure (psi / kPa) | 198.70 / 1370 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23.23" x 24.88" / 590x632 |
| Tractive Effort (lbs / kg) | 44,376 / 20128.64 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.32 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 148 - 2.008" / 51 |
| Flues (number - dia) (in / mm) | 22 - 5" / 127 |
| Flue/Tube length (ft / m) | 13.94 / 4.25 |
| Firebox Area (sq ft / m2) | 129.17 / 12 |
| Grate Area (sq ft / m2) | 25.83 / 2.40 |
| Evaporative Heating Surface (sq ft / m2) | 1617 / 150.20 |
| Superheating Surface (sq ft / m2) | 409 / 38 |
| Combined Heating Surface (sq ft / m2) | 2026 / 188.20 |
| Evaporative Heating Surface/Cylinder Volume | 132.49 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5132 |
| Same as above plus superheater percentage | 6159 |
| Same as above but substitute firebox area for grate area | 30,799 |
| Power L1 | 8242 |
| Power MT | 616.36 |