Est 0.250 to 0.500 and 0.701 to 0.766

The first series of machines was built 1858-1862 by Schneider-Creusot for the Compagnie des chemins de fer des Ardennes [fr], which later merged with the Chemins de fer de l'Est in 1863. The series then received the numbers Est 0.300-0.350.^[5]

Already in 1859 the design had been adopted by the Chemins de fer de l'Est, which had the type built from 1859 to 1884 without significant changes by their own workshops as well as various other manufacturers as series Est 0.250-0299 and 0.350-0.478.^[5]

In 1881-1882 the locomotives Est 0.479-0.500 as well as 0.701-0.708, and in 1883-1884 the 0.709-0.766 were put into service.^[6] Due to their longer fireboxes these later machines had an increased power output. The firegrate area had been increased from 1.35 m² (14.5 sq ft) to 1.63 m² (17.5 sq ft). The new boiler had a boiler pressure of 9 kg/cm² (0.883 MPa; 128 psi) and the machine's adhesive weight increased to 36.6 t (80,700 lb), while tractive effort was 5,329 kg (11,700 lb).

From 1904 to 1909 forty-eight of the machines from series 0.252-0.428 were rebuilt as 2-6-0 two-cylinder compound locomotives.^[8][9] These 48 machines were renumbered as Est 30.252 to 30.428 [fr], retaining their original numbers with an additional prefix of '3' as follows:^[8]

From 1906 to 1926 ninety-two of the machines from series 0.254-0.489 and 0.701-0.766 were rebuilt as 2-6-0 locomotives with simple expansion.^[10][9] The 92 machines were renumbered as Est 30.254 to 30.766 [fr], retaining their original numbers with an additional prefix of '3' as follows:^[10]

The locomotives of the earlier series received names. They were named as follows:^[11]

Series 0.250 – 0.299:

Series 0.300 – 0.349:

Series 0.350 – 0.387:

Series 0.401 – 0.420 (named after Merovingians):

Wikimedia Commons has media related to Est 0.250 to 0.500 and 0.701 to 0.766.

• Vilain, Lucien-Maurice (1980). L'Évolution des locomotives à vapeur de la compagnie des chemins de fer de l'Est 1853-1938 (in French). éditions Pygmalion. ISBN 2-85704-081-4.
• Deghilage (6 June 1883). "Note sur les locomotives construites pour les Chemins de fer français, De 1878 à 1881 - Deuxième partie - Locomotives a 6 roues accouplées". Revue générale des chemins de fer (in French). 6, 1er Semestre. Paris: P. Vicq-Dunod: 449–463. OCLC 6536095.
• Demoulin, Maurice (1898). Traité pratique de la machine locomotive (in French). Vol. 1. Baudry et Cie.
• Gillot, Jean (1976). Les Locomotives a Vapeur de la S.N.C.F. Région Est (in French). Editions Picador.