Completed in 1930, the Union Station Train Shed was designed by Toronto Terminals Railway Assistant Bridge Engineer A.R. Ketterson. The design was a variation on the Bush train shed, invented by American Engineer Lincoln Bush in 1904. Bush sheds replaced the expensive and difficult to maintain, large balloon-framed train sheds that were common in 19th century Europe. Linear smoke ducts directly above the tracks would permit the evacuation of smoke from locomotives while protecting passenger platforms from the elements. Other Bush sheds include: Chicago Union station 1925, Hoboken NJ 1906, Winnipeg 1911, and Montreal Windsor Station.
ERA, as Heritage Consultant, is responsible for the conservation of the Train Shed as part of Union Station Train Shed Rehabilitation. The Train Shed Rehabilitation is a major part of the 10-year program of repair, restoration and upgrading of the Metrolinx facility and railway corridor.
The Train Shed is designated a National Historic Site and is subject to a heritage easement agreement between Parks Canada and Go Transit. The project includes the construction of a new central atrium (designed by Zeidler Partnership Architects), the restoration of the shed over Tracks 1 and 2, and the rehabilitation of the remainder of the shed. Construction is to begin shortly, and is set to last 5 years.
The Union Station Train Shed, before and after revitalization. Prominent features include a large, elevated central atrium space, a through-connection to the Air Canada Center, and the extensive green roof.
Together with the Union Station Revitalization project initiated by the City of Toronto, the changes forthcoming at Union Station will greatly improve the efficiency and user experience of the station. For more information, please see the official Union Station Renewal site.