The Ontario Building Code | Communication Systems
220.127.116.11. Communication Systems
(1) In a rapid transit station, a public address system shall be installed and shall include loudspeakers that,
(a) can be operated from the central supervising station,
(b) can be operated from the rapid transit station in which they are located, and
(c) designed and located so that voice messages can be heard intelligibly throughout the public area in a rapid transit station.
(2) A two-way communication system shall be installed in each rapid transit station with telephones located at,
(a) the collector’s booth, and
(b) at each end of each platform.
(3) The telephones in Sentence (2) shall be provided with connections to the central supervising station.