|Locale||Niagara Peninsula, Ontario, Canada|
|Dates of operation||1997–|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) (standard gauge)|
|Headquarters||Port Colborne, Ontario|
The Trillium Railway (reporting mark TRRY) is a Canadian short-line railroad operating in the province of Ontario. Much of its right-of-way in the Niagara area was formerly part of the "Welland Canal Railway" (AKA Welland Railway) that closely followed the route of the second Welland Canal.
Trillium Railway began operations in 1997 with only eleven kilometres of railway, all of which were located in Port Colborne.
In the Niagara Region, Trillium's trackage, referred to as Port Colborne Harbour Railway, is made up of Canadian National's former secondary and branch lines, including a number of urban spurs, on the west side of the Canal. CN and CP interchange with Trillium at CN/CP Feeder, Trillium no longer operates on the south tracks of the Townline Tunnel under the Welland Canal. A Trillium line in Welland crosses Highway 406, forming the only at-grade rail crossing on a 400-Series Highway.
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