The locomotives were built from 1880 to 1883[1] by the Société Alsacienne de Constructions Mécaniques (SACM) in Belfort.

[2][3] Many constructive details of the boiler and the mechanisms were of a similar design as the preceding the Nord 2.800 class Outrance express locomotives, also a double frame chassis was used.

[5] The boiler consisted of three shells with an average diameter of 1.24 m (4 ft 7⁄8 in).

The cylinders, with a size of 432 mm × 610 mm (17 in × 24 in), were mounted in an inclined position inside of the frame and were controlled by a Stephenson valve gear.

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