Commuter rail is a passenger rail service connecting suburban areas with urban centres, designed primarily to serve daily commuters travelling to and from work. Unlike urban rapid transit (subways, LRT) with frequent stops, commuter rail covers longer distances with fewer stations, using heavy rail equipment similar to freight trains. Canada's largest commuter rail system is GO Transit serving the Greater Toronto and Hamilton Area, with services in Montreal (Exo) and Vancouver (West Coast Express) as well. Commuter rail helps reduce road congestion and enables people to live in suburbs while working in city centres. Service expansion is a major transit investment priority in growing metropolitan areas.