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In page Réseau Express Régional:

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During 1979, Line C (along the Left Bank of the Seine) was added, although it almost entirely comprised existing SNCF lines.[1] The main civil engineering works performed involved the construction of a connecting link between Invalides and Musée d'Orsay.[citation needed] In 1981, Line B was extended through to Gare du Nord via a new deep tunnel from Châtelet – Les Halles. It was later extended further northward.[2][3] By 1992, a total of 233 miles of track was operational, while a further 94 miles were under construction.[1]