Midi 4-4-2 Locomotives in France
Class Details by Steve Llanso of Sweat House Media
Class 1920 (Locobase 15169)
Data from Forums LR Presse, email from Patlantic, 26 June 2010, 14:35 posted at [
]. Works number for 1921 was 5633 in 1907.
Patlantic observes that these Midi Atlantics were very similar to the Nords of 1900 (Locobase 1490) but had larger Belpaire fireboxes and grates. Like most French express engines of the time, these used the Du Bousquet De Glehn form of four-cylinder compounding.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1920 |
| Locobase ID | 15169 |
| Railroad | Midi |
| Country | France |
| Whyte | 4-4-2 |
| Number in Class | 14 |
| Road Numbers | 1921-1934 |
| Gauge | Std |
| Number Built | 14 |
| Builder | SACM |
| Year | 1906 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.05 / 2.15 |
| Engine Wheelbase (ft / m) | 27.89 / 8.50 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.25 |
| Overall Wheelbase (engine & tender) (ft / m) | 49.82 / 15.19 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 39,022 / 17,700 |
| Weight on Drivers (lbs / kg) | 77,382 / 35,100 |
| Engine Weight (lbs / kg) | 152,780 / 69,300 |
| Tender Loaded Weight (lbs / kg) | 81,350 / 36,900 |
| Total Engine and Tender Weight (lbs / kg) | 234,130 / 106,200 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 64 / 32 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 80.30 / 2040 |
| Boiler Pressure (psi / kPa) | 227.70 / 1570 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13.39" x 25.2" / 340x640 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 22.05" x 25.2" / 560x640 |
| Tractive Effort (lbs / kg) | 15,912 / 7217.57 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.86 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 172.22 / 16 |
| Grate Area (sq ft / m2) | 33.15 / 3.08 |
| Evaporative Heating Surface (sq ft / m2) | 2325 / 216 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2325 / 216 |
| Evaporative Heating Surface/Cylinder Volume | 566.09 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7548 |
| Same as above plus superheater percentage | 7548 |
| Same as above but substitute firebox area for grate area | 39,214 |
| Power L1 | 8718 |
| Power MT | 496.75 |