The PO Corrèze (POC) is a former metre-gauge railway in the Corrèze department in central France. The concession was granted to the Chemin de Fer de Paris à Orléans (PO) and constructed by the Société de Construction des Batignolles. Together with the Chemin de fer du Blanc-Argent and the Blois à Saint Aignan, they formed the metre-gauge network of the PO.

In the Whyte notation for the classification of steam locomotive wheel arrangement, an 0-4-4-0 is a locomotive with no leading wheels, two sets of four driving wheels, and no trailing wheels. The arrangement is chosen to give the articulation of a locomotive with only the short rigid wheelbase of an 0-4-0, but with its weight spread across eight wheels, and with all the weight carried on the driving wheels; effectively a flexible 0-8-0. Articulated examples were constructed as Mallet, Meyer, BMAG and Double Fairlie locomotives and also as geared locomotives such as Shay, Heisler, and Climax types. A similar configuration was used on some Garratt locomotives, but it is referred to as 0-4-0+0-4-0. In the electric and diesel eras, the Bo-Bo is comparable and closest to the Meyer arrangement of two swivelling bogies.