The reference for locomotives and railcars
Chemins de fer de ceinture No. 4001 to 4005
French State Railway 240 TA 4001 to 4005
France | 1906 | 5 produced
Die Lokomotive, November 1908

After the purchase of the 4-6-0T tank locomotives with the numbers 51 to 65, the Paris belt railway needed even more powerful locomotives that were primarily intended to pull freight trains. The requirements stipulated that freight trains weighing 550 tonnes should be pulled on a gradient of one percent and 430 tonnes at 1.5 percent. At times of high passenger traffic volumes, additional passenger trains were to be pulled.

This time again tank locomotives with a front bogie and without trailing axles were ordered. The five locomotives therefore had a 4-8-0T wheel arrangement and a four-cylinder compound engine. While this was still implemented in a tandem arrangement on the locomotives with numbers 51 to 65, the design customary in France according to De Glehn was used here. The high-pressure cylinders were on the outside at the height of the rear axle of the bogie and drove the second coupled wheel set, while the low-pressure cylinders were inside the bogie and drove the first coupled wheel set.

Since all the cylinders were inclined and mounted higher up and the water tanks started behind the bogie, the easy accessibility of the cylinders for maintenance was ensured. The leading bogie made it possible to move passenger trains at 70 km/h without sacrificing smooth running. The ability of the coupled axles to negotiate curves was realized without movable axles by weakening the wheel flanges of the second and third axles.

Axle config4-8-0T (Twelve-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase27 ft 8 11/16 in
Fixed wheelbase15 ft 7 in
Empty weight144,403 lbs
Service weight177,913 lbs
Adhesive weight134,482 lbs
Axle load34,833 lbs
Water capacity1,585 us gal
Fuel capacity6,614 lbs (coal)
Power sourcesteam
Estimated power939 hp (700 kW)
Optimal speed24 mph
Top speed43 mph
Starting effort24,929 lbf
with start valve29,915 lbf
Power Plant
Driver diameter56.7 in
Boiler pressure218 psi
Expansion typecompound
Cylindersfour, HP: 14 9/16 x 25 9/16 in
and LP: 22 7/16 x 25 9/16 in
Grate area24.4 sq ft
Firebox area133.5 sq ft
Tube heating area2,055.4 sq ft
Evaporative heating area2,188.8 sq ft
Total heating area2,188.8 sq ft
Calculated Values
steam locomotive
tank locomotive
De Glehn compound
last changed: 06/2022

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