line 10 steadily began to mold to its present configuration from then on. one objective stood to link "porte d'auteuil" to "gare d'austerlitz" so to have a more coherent east–west route. the extension from jussieu to "gare d'austerlitz" is 1,027 metres long. construction began in 1934, however it ran into a number of difficulties resulting from its proximity to the seine and the railroad tracks of "austerlitz-gare d'orsay" under which a part of a tunnel had to be used. construction of the infrastructure was completed on 14 september 1938, and the extension was opened to the public on 12 july 1939.