Rapido was the name of the Canadian National Railway's express passenger train service on the Quebec City-Windsor Corridor. The service was introduced on October 31, 1965, on the Montreal-Toronto route. In 1966, service was extended to the Montreal-Quebec City route and later, to other city pairs, including Toronto-Windsor/Sarnia and Toronto-Ottawa.
In the 1980s, in addition to being branded as Rapido, each express train was also given a name related to the route's particular geographical or historical context. Some names included Frontenac (after the Château Frontenac in Quebec City), Rideau (after the Rideau Canal in Ottawa) and Ville-Marie (the original name of Montreal).
The brand was used on advertising material and timetables until the 1990s, surviving for many years the reorganization of the train schedules under the new Via Rail brand. Today, Via Rail no longer uses the Rapido brand and route maps simply refer to this section as the Corridor. Additionally, the dedicated train names were dropped and trains are currently identified by number only, contrary to the rest of the route system.