As a successor to the Pacific locomotives of the series 231-011 to 060, starting in 1914 the État had the first batch of the locomotives built, which were later to bear the numbers 231-501 to 783. The new locomotives were also four-cylinder compounds, but were superheated at the same time. The first series comprised ten locomotives, of which only six were delivered when the Germans marched into Lille. The other four locomotives were brought to Germany after completion. Other batches were built by different manufacturers, including the North British Locomotive Company.

When they were delivered, they were already state of the art, which was also found in other French express locomotives. This included a Du Bousquet-De Glehn type layout, in which the high-pressure cylinders were located on the outside and pushed far to the rear because they drove the middle driving axle. Meanwhile, the low-pressure cylinders were on the inside, driving the first driving axle. In addition, they had a cloverleaf-shaped blast pipe and a tender with a scoop for filling water at full speed. Between 1933 and 1949 the locomotives were rebuilt in various forms, resulting in a total of six types. The changes affected different forms of valve gear, but some were also provided with feedwater heaters or a longer smokebox.

Among the total of 283 locomotives that had been manufactured until 1922 were some designated as “Pacific TP” that had been delivered to the PO and the Alsatian Railway during the war as relief. When the SNCF was founded, these were designated 231 C, D, F, G, H and J, together with the six designs delivered to the État. After some lines around Paris had been electrified from 1937, their service area was reduced. After modern diesel locomotives had also taken over the express service on non-electrified lines, the last journey of a 231 G took place in September 1968. One of these 231 Gs is still operational today.