1970, April 21 - Canadian Pacific unveils Canada's first double-deck passenger train comprising nine air-conditioned cars built by Canadian Vickers Limited at a cost of $2.8 million. The cars went into operation April 27 on the Montreal Lakeshore suburban service.

1933, April 21 - London, Midland and Scottish Railway (UK) 4-6-0 steam locomotive Royal Scot arrives in Montreal with eight passenger cars en route to the Century of Progress Exhibition in Chicago. It was exhibited at the following cities (numbers in brackets show numbers of visitors). May 1 - Montreal Windsor Station (16,979); May 2 - Ottawa (11,870); May 3-4 - Toronto Exhibition Grounds (20,687); May 4 - Hamilton (3,631). The train then ran via the Toronto, Hamilton and Buffalo Railway through US cities to Chicago. After the exhibition, it left Chicago October 11 and ran via the US to Vancouver:

1976, April 22 - the Turbo train achieves a speed of 140.6 mph/226.2 kph near Morrisburg, Ontario on the Canadian National Kingston subdivision, a Canadian rail speed record.

1955, April 24 - Canadian Pacific inaugurates its new stainless steel, scenic-domed transcontinental passenger train "The Canadian" between Montreal/Toronto and Vancouver.