This 9,300-square-meter roundhouse was built between 1929 and 1931 by the Canadian Pacific Railway Company and became known as the John Street roundhouse. The roundhouse originally had stalls for 32 locomotives that were moved in and out of the structure on a massive 120-foot rotating turntable designed by the Canadian Bridge Company. Locomotives were driven onto the turntable and rotated for positioning into one of the stalls for servicing and light repairs.
[www.trha.ca/johnstreet.html]