Data from Maurice Demoulin, Traite Pratique de la Machine Locomotive (Paris: Libraire Polytechnique, Baudry et Cie, 1898), pp. 130-131. See also Albert Jacquet, "'Engerth'" Locomotives on French and Belgian Railways", Locomotive Magazine, Volume XXVIII [28] (15 March 1922), pp. 74-77
As it joined the suddenly lively market for eight-coupled freight engines in France in the late 1860s, this class adopted different proportions of boiler and grate such that the boiler had plenty of steam for the rather sizable cylinders, but the firebox and grate presumably worked hard to heat the water.
Le Creusot led the parade by supplying the first 25 in 1856-1857. The data refer specifically to those supplied in 1866-1872 by Grafenstaden (0.526-0.541 in 1866-1867), Fives-Lille (0.542-0.557 in 1869), and l'Est's own Epernay works (0.558-0.563 in 1870-1872). Later batches included SACM's deliveries (0.564-0.595) in 1881-1882 and the 1886 deliveries from Le Cruesot (0.596-0.641 and 0.679-0.691), Etablissement Cail (0.642-0.666), and SACM (0.667-0.678).
The dome sat on the boiler's second course just ahead of the second driving axle and held the safety valve. The regulator sat between the dome and the stack. Each pair of axles was balanced and, if I read my French aright, the lead drivers were counter-balanced with 1,100 kg (2,425 lb) of weight.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 0.526 |
| Locobase ID | 11274 |
| Railroad | Est |
| Country | France |
| Whyte | 0-8-0 |
| Number in Class | 191 |
| Road Numbers | 0.501-0.691 |
| Gauge | Std |
| Number Built | 191 |
| Builder | several |
| Year | 1856 |
| Valve Gear | Gooch |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.96 / 3.95 |
| Engine Wheelbase (ft / m) | 12.96 / 3.95 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 12.96 / 3.95 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 108,467 / 49,200 |
| Engine Weight (lbs / kg) | 108,467 / 49,200 |
| 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) | 45 / 22.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49.60 / 1260 |
| Boiler Pressure (psi / kPa) | 127.60 / 880 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19.69" x 25.98" / 500x660 |
| Tractive Effort (lbs / kg) | 22,025 / 9990.38 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.92 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 218 - 1.929" / 49 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 17.32 / 5.28 |
| Firebox Area (sq ft / m2) | 89.34 / 8.30 |
| Grate Area (sq ft / m2) | 20.67 / 1.92 |
| Evaporative Heating Surface (sq ft / m2) | 1985 / 184.40 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1985 / 184.40 |
| Evaporative Heating Surface/Cylinder Volume | 216.80 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2637 |
| Same as above plus superheater percentage | 2637 |
| Same as above but substitute firebox area for grate area | 11,400 |
| Power L1 | 2801 |
| Power MT | 227.72 |