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Paris-Lyon-Méditerranée 242 AT 1 to 120
French State Railway 5-242 TA
France | 1926 | 120 produced
Locomotive Magazine, January 1928

The 242 AT was the first of four series of 4-8-4T tank locomotives that the PLM had built to accelerate the suburban trains that departed from the Gare de Lyon in Paris. They replaced the tank locomotives 232 AT and 232 BT. A total of three manufacturers delivered 120 locomotives between 1926 and 1929.

They had a Belpaire firebox with a steeply sloped grate between the wheels of the third and fourth driving axles. Power was transmitted via four compound cylinders of the de Glehn system. Over the years it often became apparent that the frames were too weak for the long wheelbase.

They were classified by the SNCF as 5-242 TA. After the war, they were distributed across several regions and received region-specific adjustments, for example wind deflectors. They were decommissioned by 1968.

General
Built1926-1929
ManufacturerFives-Lille, Bâtignolles-Châtillon, Schneider
Axle config4-8-4T (Northern) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length58 ft 5 3/4 in
Wheelbase47 ft 0 15/16 in
Fixed wheelbase19 ft 4 5/16 in
Service weight264,601 lbs
Adhesive weight143,325 lbs
Axle load35,274 lbs
Water capacity3,170 us gal
Fuel capacity11,023 lbs (coal)
Power
Power sourcesteam
Estimated power1,877 hp (1,400 kW)
Optimal speed41 mph
Top speed59 mph
Starting effort29,422 lbf
with start valve35,306 lbf
Power Plant
Driver diameter65 in
Boiler pressure232 psi
Expansion typecompound
Cylindersfour, HP: 16 9/16 x 25 9/16 in
and LP: 24 13/16 x 25 9/16 in
Boiler
Grate area33.2 sq ft
Firebox area173.9 sq ft
Tube heating area1,693.1 sq ft
Evaporative heating area1,867 sq ft
Superheater area485.5 sq ft
Total heating area2,352.5 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
De Glehn compound
last changed: 02/2024
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