"Automatic Train Control Installed on Toronto Transit Line 1"

"Prior to this upgrade, portions of TTC’s signalling system dated back to the 1950s, when Toronto’s subway..." (May, 2022) 

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References:
May, Tiana. (2022, Oct 4th) Automatic Train Control Installed on Toronto Transit Line 1. Retrieved from Railway-News: Automatic Train Control Installed on Toronto Transit Line 1 | Railway-News