From 1913 to 1956, commuter service to Montreal was provided by the
Montreal and Southern Counties Railway with four stops in what is now Chambly. The Conseil intermunicipal de transport Chambly-Richelieu-Carignan (CITCRC) was formed in 1984. In 1993 it was agreed to expand service to St-Mathias-sur-Richelieu, and in 1994 it was the turn of
Marieville to join. In 2000, the
Agence métropolitaine de transport (predecessor to
Exo and
Autorité régionale de transport métropolitain) opened a park and ride in Chambly for commuters into
Montreal.
Gestrans was contracted to manage the transportation system from 2008 through 2012 with
Veolia Transport (formerly Connex) operating the buses, under an agreement that expired at the end of 2011. In July 2012 a one-year pilot project was announced making these new local lines fare-free; only rides outside of the CIT territory would require a fare. In October 2012, the CIT was rebranded to
Blus (an acronym combining
bus and
plus), with a new visual identity. The fare-free pilot project was made permanent. On June 1, 2017, a new law reorganizing public transit agencies in
Greater Montreal abolished the CITs and established a new
Réseau de transport métropolitain (RTM, later branded
Exo), that, among other things, assumed the Blus responsibilities, assets and employees. When the
Réseau express métropolitain started service between
Montreal Central Station and
Brossard in July 2023, Exo reorganized the bus network in the Chambly-Richelieu-Carignan sector. Bus routes that went to
Terminus Centre-Ville or
Terminus Panama now terminated at the new
Brossard REM station. A new bus route numbering scheme was also implemented. ==Fares==