Data from DeGolyer, Vol 57, pp. 136. Works numbers were 48741 in May 1918; 48899-48900, 48938, 48991 in June; 49150-49151, 49240, 49291, 49355m 49407 in July; 49479-49480, 49542, 49638, 49656-49657 in August; 49730 in September; 50345 in October; 50445, 50547-50548, 50673, 50732 in November; 50782-50783, 50874, 50939 in December; 51031-51032, 51082, 51152-51153 in January 1919; 51232-51233, 51257, 51384 in February; 51449-51452, 51510, 51559-51560, 51579 in March; 51663-51664, 51706-51708 in April.
This was the same design as the 117 PLM Mikados shown in Locobase 7987. Of the 100 that were ordered from Baldwin, however, half were lost at sea when the ship that carried them was torpedoed and sunk.
Although the engines were in most respects identical, detail changes included a Nord-style smokebox door and a trefoil exhaust nozzle.
Data from Reder (1974) and Robert Tufnell, The Illustrated Encyclopedia of Railway Locomotives (London: Quarto Publishing Ltd, 1986).
Year Builder Works numbers Road numbers
1932-1933 Nord's Hellemmes shops. 4.1201-1205
1933-1934 SACM 7688-7697 1206-1215
1934 ANF (Blanc-Misseron) 402-411 1216-1225
1933-1934 Societe Franco-Belge 2679-2696 1226-1235, 1244-1251
1934-1935 ANF (Blanc-Misseron 412-419 1236-1243
1934 Schneider 4638-4646 1252-1260
1934 Fives-Lille 4849-4854 1261-1266
1934-1935 SFCM 4254-4259 1267-1272
Cylinder dimensions were later reduced to 585 mm (23.03 inches) and boiler pressure reduced 16 bar (232 psi).
They ran push-pull commuter operations out of the Gare du Nord in Paris. Tests showed a drawbar horsepower of 1,680 hp (1,253 kW), which those low drivers doubtless put to good use in their frequent starts and quick acceleration.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 141A | 4.1201-1272/2-141 TC |
| Locobase ID | 14587 | 2132 |
| Railroad | Nord | Nord |
| Country | France | France |
| Whyte | 2-8-2 | 2-8-2T |
| Number in Class | 50 | 72 |
| Road Numbers | 4.1101-4.1150 /141.A 1-141.A 40 | 1201-1272/2-141 TC 1 a 72 |
| Gauge | Std | Std |
| Number Built | 50 | 72 |
| Builder | Baldwin | several |
| Year | 1918 | 1932 |
| Valve Gear | Walschaert | Cossart |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 17.72 / 5.40 | 17.72 / 5.40 |
| Engine Wheelbase (ft / m) | 36.25 / 11.05 | 37.40 / 11.40 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.49 | 0.47 |
| Overall Wheelbase (engine & tender) (ft / m) | 60.32 / 18.39 | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 160,000 / 72,575 | 187,426 / 85,015 |
| Engine Weight (lbs / kg) | 210,000 / 95,255 | 270,112 / 122,521 |
| Tender Loaded Weight (lbs / kg) | 108,555 / 49,240 | |
| Total Engine and Tender Weight (lbs / kg) | 318,555 / 144,495 | 270,112 / 122,521 |
| Tender Water Capacity (gals / ML) | 6072 / 23 | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 67 / 33.50 | 78 / 39 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 65.40 / 1660 | 61 / 1550 |
| Boiler Pressure (psi / kPa) | 227.70 / 1570 | 269.80 / 1860 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20.08" x 25.59" / 510x650 | 25.2" x 27.56" / 640x700 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 28.35" x 27.56" / 720x700 | |
| Tractive Effort (lbs / kg) | 41,663 / 18898.04 | 65,798 / 29845.51 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.84 | 2.85 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 143 - 2.165" / 55 | |
| Flues (number - dia) (in / mm) | 28 - 5.236" / 133 | |
| Flue/Tube length (ft / m) | 19.82 / 6.04 | |
| Firebox Area (sq ft / m2) | 172.22 / 16 | |
| Grate Area (sq ft / m2) | 43.49 / 4.04 | 33.26 / 3.09 |
| Evaporative Heating Surface (sq ft / m2) | 2526 / 234.70 | 1954 / 181.51 |
| Superheating Surface (sq ft / m2) | 687 / 63.80 | 691 / 64.22 |
| Combined Heating Surface (sq ft / m2) | 3213 / 298.50 | 2645 / 245.73 |
| Evaporative Heating Surface/Cylinder Volume | 269.31 | 122.82 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 9903 | 8974 |
| Same as above plus superheater percentage | 11,982 | 11,307 |
| Same as above but substitute firebox area for grate area | 47,450 | |
| Power L1 | 11,796 | |
| Power MT | 650.14 | |