SNCF 4-6-4 Locomotives in France

Class Details by Steve Llanso of Sweat House Media

Class 232U (Locobase 2465)

Data from Ransome-Wallis (1959); Gustav Reder (Michael Reynolds, trans), The world of steam locomotives (New York: Putnam, 1974); and Hollingsworth (1982).

SNCF calculation of tractive effort yielded 46,958 lb. The only post-war example of a group of eight experimental Baltic engines planned before World War II, this relatively conventional compound locomotive was built on the frame of the turbine-powered example. (The other 7 would have been 3 simple-expansion 232.R and 4 compound 232.S;see Locobase 9979 and 9980))

Although it took advantage of the most recent steam locomotive innovations such as roller bearings and cast bar-type framing, French railroading was already beginning to electrify. Therefore, although this engine was quite satisfactory in service between Paris and Lille pulling 500-ton trains, it remained the only one of its class.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2465
Number in Class1
Road Numbers232 U1
Number Built1
BuilderCorpet, Louvet & Cie
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.40 / 4.39
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)74.12 / 22.59
Axle Loading (Maximum Weight per Axle) (lbs / kg)50,706 / 23,000
Weight on Drivers (lbs / kg)152,000 / 68,950
Engine Weight (lbs / kg)284,396 / 129,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)10,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 9.90 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)84 / 42
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78.70 / 2000
Boiler Pressure (psi / kPa)295.90 / 20.40
High Pressure Cylinders (dia x stroke) (in / mm)17.56" x 27.56" / 445x700
Low Pressure Cylinders (dia x stroke) (in / mm)26.77" x 27.56" / 680x700
Tractive Effort (lbs / kg)37,977 / 17226.10
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.00
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)55.70 / 5.18
Evaporative Heating Surface (sq ft / m2)2098 / 195
Superheating Surface (sq ft / m2)941 / 87.45
Combined Heating Surface (sq ft / m2)3039 / 282.45
Evaporative Heating Surface/Cylinder Volume271.58
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation16,482
Same as above plus superheater percentage21,591
Same as above but substitute firebox area for grate area
Power L1
Power MT

All material Copyright ©
Wes Barris