The construction of the
Grand Trunk Railway‘s Sunnyside Station coincided with a major grade separation project that took place through south Parkdale in the early 1900’s. The project involved the closure of the Grand Trunk’s South Parkdale station and Sunnyside station was essentially its replacement. It was built at the foot of Roncesvalles Avenue, a few kilometers west of the South Parkdale station. First, a temporary structure was built in 1911 for passengers to use while the permanent structure was being built. This was completed in 1913, and featured a pedestrian flyover to access the platforms from street level. Situated on a four-track section of mainline, the station had a platform on the north track as well as one in between the two middle tracks.
In addition to the Grand Trunk, Sunnyside Station was also used by the Toronto, Hamilton & Buffalo Railway via trackage rights over the Grand Trunk into Toronto Union Station. It was commonly a stop on the TH&B’s trains between Toronto and Buffalo. The TH&B would continue to serve this station under
Canadian National, at least until 1954. After this, Canadian Pacific’s Budd Rail Diesel Cars between Toronto and Hamilton over the TH&B but this, too, would end in 1967. That year, Canadian National also stopped serving Sunnyside as GO Transit took over commuter service out of Toronto. GO chose to build their own stations at Exhibition and Long Branch rather than use the existing Sunnyside station, and as a result it was demolished in 1973.