Harbourfront-CityPlace in Toronto, Ontario — Central Canada (North America)

Cabin D

Photographed by Tim Boyd, November 14, 2025

1. Cabin D Marker

Inscription. Cabin D was an interlocking tower built by the Grand Trunk Railway in the 1890s It was one of five towers lettered from A to E that controlled the signal lights and track switches around Union Station The tower was originally located along the mainline rail corridor at the junction west of Bathurst Street where several railway tracks diverged. In 1931, Cabins A, B & C were replaced by more modern structures while Cabin D remained in place. This tower was unusual in that its control of the track switches was not electro-mechanical as it was in the newer towers.

Cabin D employed switch tenders, personnel who scurried around the tracks near the Bathurst Street bridge and manually positioned the track switches according to directions broadcast by loudspeaker from the tower. This anachronistic operation remained un place until the 1980s, when the rapidly expanding GO Transit Service created a rail traffic bottleneck that caused significant delays for commuters. A rail underpass known as the flyunder, located between Spadina Avenue and Bathurst Street, alleviated the problem and opened in 1983. Cabin D was then retired and moved to the roundhouse.

Erected by Toronto Railway Heritage Centre. (Marker Number 9.)

Topics. This historical marker is listed in this topic list: Railroads & Streetcars

Paid Advertisement

Click or scan to see
this page online

. A significant historical year for this entry is 1931.

Location. 43° 38.508′ N, 79° 23.106′ W. Marker is in Toronto, Ontario. It is in Harbourfront-CityPlace. It can be reached from Bremner Boulevard. The marker is in Roundhouse Park, approx. 70 metres from the entrance to the park at Bremner Boulevard and Lower Simcoe Street. Touch for map. Marker is at or near this postal address: 255 Bremner Boulevard, Toronto ON M5V 3L9, Canada. Touch for directions.

Regionally, this marker is in Greater Toronto

and on the Golden Horseshoe.

It is also in Central Canada.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once a British colony,

the Viceroyalty of New France,

the Haudenosaunee (Iroquois) Confederacy,

and Rupert’s Land.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Watchman’s Shanty (within shouting distance of this marker); Don Station (within shouting distance of this marker); Canadian Pacific Railway “Cape Race” (within shouting distance of this marker); Workers of John Street (within shouting distance of this marker); Water Tower (within shouting distance of this marker); Turntable (within shouting distance of this marker); Canadian Pacific Railway, Fowler Boxcar No. 188625 (about 90 meters away, measured in a direct line); Roundhouse (about 90 meters away). Touch for a list and map of all markers in Toronto.

Cabin D marker photos and captions details (top) image. Click for full size.

Photographed by Tim Boyd, November 14, 2025

2. Cabin D marker photos and captions details (top)

Cabin D marker photo and caption detail (bottom) image. Click for full size.

3. Cabin D marker photo and caption detail (bottom)

Photographed by Tim Boyd, November 14, 2025

4. Cabin D Marker

Facing north towards Bremner Boulevard

Cabin D at its Roundhouse Park location, 2025 image. Click for full size.

Photographed by Tim Boyd, November 14, 2025

5. Cabin D at its Roundhouse Park location, 2025

Credits. This page was last revised on February 24, 2026. It was originally submitted on November 15, 2025, by Tim Boyd of Hamilton, Ontario. This page has been viewed 43 times since then and 17 times this year. Photos: 1, 2, 3, 4, 5. submitted on November 15, 2025, by Tim Boyd of Hamilton, Ontario. • Andrew Ruppenstein was the editor who published this page.