On 14 July 1984, after pressure from several municipalities and inhabitants of the Manche département, the association increased its interest to the preservation of all local railways in the Manche and became Association pour les Transports en Commun de la Manche (ATCM).
In July 1984, due to pressure from towns and residents within the Manche department, the organization dedicated itself more strongly to preserving all local railway lines in the region. This led to the association officially changing its name to Association pour les Transports en Commun de la Manche (ATCM).