The Built Corridors:
- The Lakeshore West Corridor (Union Station to Oakville/Hamilton — May 23, 1967
- The Lakeshore East Corridor (Union Station to Pickering/Oshawa/Bowmanville) — May 23, 1967
- The Georgetown Corridor (Union Station to Georgetown/Guelph) — April 29th, 1974
- The Richmond Hill Corridor (Union Station to Richmond Hill) — May 1, 1978
- The Milton Corridor (Union Station to Milton) — October 25th, 1981
- The Newmarket/Bradford Corridor (Union Station to Bradford/Barrie) — September 7th, 1982
- The Stouffville Corridor (Union Station to Stouffville/Uxbridge) — September 7th, 1982
Corridors to come?
- The Midtown Corridor (Kipling/Erindale to Markham Road?)
- The Woodbridge/Bolton Corridor (Union Station to Bolton?)
- The Streetsville/Orangeville Corridor (Union Station to Orangeville?)
- The Agincourt/Peterborough Corridor (Union Station to Havelock?)
Corridors Never Built
- The GO-ALRT Project (by Peter Drost)

