Est 0-8-4 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class Type 28 (Locobase 20428)

Data from Schneider Catalogue, last accessed 27 August 2018 at [], pp. 10-11. See also Albert Jacquet, "'Engerth'" Locomotives on French and Belgian Railways", Locomotive Magazine, Volume XXVIII [28] (15 March 1922), pp. 74-77. Works numbers were 243-266 in 1856-1857..

Engerth goods tanks named for characters in the satires of Francois Rabelais (see Jacquet for full list.) Alas for Rabelais and other connected with this design, the class "presented grave defects". Perhaps most significant was a connection between the tender and the engine so rigid that it caused several derailings. One at Nancy evaded re-railing until workers dug out the roadbed under the tender. Moreover, the promised increase in adhesive weight proved "quite insignificant."

Between 1860 and 1868, the Est's Epernay shops reconfigured the class as 0-8-0s with separate tenders. Without the tender, the firebox's weight behind the last driving axle required inserting a 3,700 kg counter-weight between the frames and just behind the buffer beam. Water capacity in the tender remained the same, but coal capacity increased to 6 metric tons (6.6 short tons).

See Locobase 11274 for the long-running 0-8-0 design inspired by these Engerth tender engines.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassType 28
Locobase ID20428
Number in Class25
Road Numbers0.164-0.188/0.501-0.525
Number Built25
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.96 / 3.95
Engine Wheelbase (ft / m)28.54 / 8.70
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)28.54 / 8.70
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)86,015 / 39,016
Engine Weight (lbs / kg)138,891 / 63,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2215 / 8.39
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)36 / 18
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)49.60 / 1260
Boiler Pressure (psi / kPa)98.60 / 6.80
High Pressure Cylinders (dia x stroke) (in / mm)19.69" x 25.98" / 500x660
Tractive Effort (lbs / kg)17,019 / 7719.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.05
Heating Ability
Tubes (number - dia) (in / mm)235 - 1.94" / 49
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)16.40 / 5
Firebox Area (sq ft / m2)104.41 / 9.70
Grate Area (sq ft / m2)20.88 / 1.94
Evaporative Heating Surface (sq ft / m2)2062 / 191.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2062 / 191.57
Evaporative Heating Surface/Cylinder Volume225.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2059
Same as above plus superheater percentage2059
Same as above but substitute firebox area for grate area10,295
Power L12300
Power MT235.80

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