The reference for locomotives and railcars
Paris-Orléans No. 5301 to 5490
French State Railway 4-141 TA
France | 1911 | 190 produced
Locomotive Magazine, April 1917

In 1911, the PO ordered 2-8-2T tank locomotives from SLM in Switzerland for the transport of freight trains, but also passenger trains, on the steep lines in the Massif Central. They were based on a locomotive that had already been built for the Thunerseebahn in 1908. Further batches were supplied by French manufacturers and North British.

A special feature for locomotives with this wheel arrangement was the drive on the second coupled axle. In order to be able to run through small curve radii, the first and last driving axles were combined with the neighboring carrying axle to form a Zara bogie. This resulted in a fixed wheelbase of just 1,500 mm. The blastpipe consisted of a variable cone and a three-fold cloverleaf nozzle.

They were able to pull a 200-tonne train at 30 km/h on a 3.5 percent ramp. On the flat they reached their top speed of 70 km/h with up to 1,500 tonnes. The special shape of the coal bunker earned the locomotives the nickname “boat butt”.

Between 1924 and 1929, 31 locomotives were transferred to Morocco. The PO rebuilt all of its locomotives to a Kylchap exhaust system. Some later received Worthington feed water heaters, and most of them also had their boiler pressure increased to 13 bars. At the SNCF they were also used far away from the Massif Central and were designated 4-141 TA. The last machine was retired in May 1970.

Variant5301-5380, 5411-54905381-5410
ManufacturerSLM, Fives-Lille, Bâtignolles-Châtillon, North British, Schneider
Axle config2-8-2T (Mikado) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length44 ft 1 1/2 in
Wheelbase31 ft 9 7/8 in
Fixed wheelbase4 ft 11 1/16 in
Empty weight161,378 lbs
Service weight204,148 lbs
Adhesive weight148,591 lbs
Axle load39,463 lbs
Water capacity2,642 us gal
Fuel capacity12,125 lbs (coal)
Power sourcesteam
Estimated power1,073 hp (800 kW)1,207 hp (900 kW)
Optimal speed18 mph19 mph
Top speed43 mph
Starting effort38,317 lbf41,510 lbf
Power Plant
Driver diameter55.1 in
Boiler pressure174 psi188 psi
Expansion typesimple
Cylinderstwo, 23 5/8 x 25 9/16 in
Grate area29.5 sq ft29.4 sq ft
Firebox area155.5 sq ft
Tube heating area2,001.4 sq ft1,854.6 sq ft
Evaporative heating area2,157 sq ft2,010.2 sq ft
Superheater area399 sq ft441.3 sq ft
Total heating area2,556 sq ft2,451.5 sq ft
Calculated Values
steam locomotive
tank locomotive
last changed: 12/2023

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