The Toronto Transit Commission (TTC) maintains five rapid transit lines and 109 stations on 100.1 km (62.2 mi) of route. == Mainline trackage == === Gauge === The TTC's heavy rail lines – Lines 1, 2, and 4 – are built to the unique Toronto gauge of 4 ft 10+7⁄8 in (1,495 mm), which is the same gauge used on the city's streetcar system.
The Toronto Transit Commission (TTC) maintains five rapid transit lines and 109 stations on 100.1 km (62.2 mi) of route. == Mainline trackage == === Gauge === The TTC's heavy rail lines – Lines 1, 2, and 4 – are built to the unique Toronto gauge of 4 ft 10+7⁄8 in (1,495 mm), which is the same gauge used on the city's streetcar system.
Source: Wikipedia "Toronto subway trackage" · CC BY-SA 4.0
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