The Exo Richelain / Roussillon sector is the division of Exo that delivers bus service to the municipalities of La Prairie, Candiac, Delson, Saint-Constant, Saint-Philippe and Sainte-Catherine, which are suburbs southeast of Montreal, Quebec, Canada. The territory serviced lies in the Roussillon Regional County Municipality.
At the time when Exo was created in 2017, the territory that this now sector covers was served by three organizations:
The expired contract for transport services between Transdev Limocar and CIT Roussillon was a 10-year contract that ended on July 15, 2018. In 2018, Exo awarded Transdev the contract to run service for the Richelain sector. The contract start date was January 1, 2019 and runs till June 30, 2024 with a 3-year option for exo to extend the contract till June 30, 2027.
Exo operated Roussillon and Le Richelian as their own sectors until they were merged on July 31, 2023, when the Réseau express métropolitain opened. The new sector's bus network was reconfigured to send commuters heading downtown to Panama and Brossard stations instead of Terminus Centre-Ville.