SNCF 4-240A
#4703, the third 4-240A, during the PO days.
Type and origin Power type Steam Designer André Chapelon
Specifications Configuration: ​  • Whyte 4-8-0  • UIC 2′D h4v Driver dia. 1,900 mm (74.80 in) Length 20.79 m (68 ft 3 in) Axle load 20 t (19.7 long tons; 22.0 short tons) Adhesive weight 80.5 t (79.2 long tons; 88.7 short tons) Loco weight 136.5 t (134.3 long tons; 150.5 short tons) Tender cap. 12 t (11.8 long tons; 13.2 short tons) coal 34,000 L (7,500 imp gal; 9,000 US gal) Firebox: ​  • Grate area 3.75 m2 (40.4 sq ft) Boiler pressure 2.00 MPa (290 psi) Heating surface 213 m2 (2,290 sq ft) Superheater: ​  • Heating area 68 m2 (730 sq ft) High-pressure cylinder 420 mm × 650 mm (16.535 in × 25.591 in) Low-pressure cylinder 650 mm × 690 mm (25.591 in × 27.165 in)
Performance figures Power output 4,000 hp (3.0 MW) Tractive effort 260.40 kN (58,540 lbf) "starting" mode, 207.61 kN (46,670 lbf) normal compound mode

The SNCF 4-240A class and SNCF 5-240P class was a group of 37 (12 + 25) 4-8-0 steam locomotives designed by André Chapelon, and regarded by some, as one of his best designs.

They started life as Chemin de Fer de Paris à Orléans (Paris-Orleans Railway) 4500 class 4-6-2s before being rebuilt. The new boiler with the long, narrow Belpaire firebox came from the Nord "Super Pacifics". With all the pipes, domes, and pumps, these were double-chimneyed, husky looking locomotives of very different appearance than the Pacifics.

Use

4-240A

SNCF south-west.

These 12 4-8-0s were created to tackle the 1:100 gradients of the Brive to Montauban division of the line from Paris to Toulouse, steeper than those to Bordeaux. The intention was to provide one-third more adhesive weight than the 4500s. On level ground, they could manage 28 coaches at 53 mph (85 km/h).

5-240P

SNCF south-east.

These 25 4-8-0s were created by 1940 to tackle the 1:125 gradient of the Les Laumes to Dijon division of the line from Paris to Lyon. Used in passenger and fast freight services between Paris and Lyon. Withdrawn by 1950 with the electrification of the Paris - Dijon section. These later locomotives had mechanical stokers and bogie tenders.