Мон-Сен-Илер қалалық темір жол желісі

Commuter rail line in Greater Montreal

Mont Saint Hilaire (also designated line 13) is a commuter railway line in Greater Montreal, Quebec, Canada. It is operated by Exo, the operator of public transport services across this region. The Mont Saint Hilaire line was operated by the Grand Trunk Railway (GTR) from 1859 to 1923, and by Canadian National Railway (CN) from 1923 to 1988, following the GTR's merger into CN. There was no commuter train service on the line after 1988 until Exo's predecessor agency, the Agence Métropolitaine de transport (AMT), resumed passenger service in 2000. There are 7 inbound and 7 outbound departures per weekday. This line does not run on weekends.

This line links the Central Station in downtown Montreal with Mont Saint Hilaire, on Montreal's South Shore. The line offers seven departures every weekday morning towards Montreal and seven returns to Saint Hilaire every weekday evening. It is also the only commuter train line not to have any train stations on the island of Montreal outside of Downtown Montreal. All the other train lines have at least 4 stops before leaving the island. The trains are owned and managed by Exo, and operated by Alstom's Transportation division (formerly Bombardier Transportation). Today, over 9,000 people ride this train daily.

This commuter route was opened by the Grand Trunk in 1859. CN equipment in the late 1960s and early 1970s, operated once daily each direction, was a hodgepodge of ca 1930 coaches and an equally eclectic mix of yard switchers, freight and passenger diesel electric engines. Service was suspended in 1988, due to low ridership and old equipment used.

During the Oka Crisis in the summer of 1990, the Société de transport de la communauté urbaine de Montréal (STCUM) organized a temporary rail shuttle service between Montreal Central Station and the town of Saint Isidore due to the closure of the Honoré Mercier Bridge during said crisis. That service used part of the present day Mont Saint Hilaire line between Montreal Central Station and Saint Lambert station via Victoria Bridge, and then branched off to the CN Rouses Point Subdivision towards Saint Isidore.

The Mont Saint Hilaire line was re opened in 2000 (between Montreal Central Station and McMasterville) by the AMT as a measure to mitigate traffic congestion caused by roadwork. Train service was progressively increased to respond to rapidly growing demand. The line was extended to its current terminus at Mont Saint Hilaire in 2002.

On June 1, 2017, the AMT was dissolved and replaced by two new governing bodies, the Autorité régionale de transport métropolitain (ARTM) and the Réseau de transport métropolitain (RTM). The RTM took over all former AMT services, including this line. In May 2018, the RTM rebranded itself as Exo, and rebranded each line with a number and updated colour. The Mont Saint Hilaire line became Exo 3, and its line colour was updated to a lighter pastel shade of violet. In 2023, the service was renumbered to line 13 in order to be unique within the Montreal rail network.

In 2019, civic organization Trajectoire Québec proposed several improvements to the Mont Saint Hilaire line, which has seen little service changes since the early 2000s. Among such proposals are increasing the frequency of trains to accommodate passengers transferring from South Shore bus services that would no longer directly run to Downtown Montreal following the opening of the Réseau express métropolitain, relocating the Saint Bruno station closer to residential neighbourhoods and potentially extending the line to Saint Hyacinthe.