What is the current state of the law regarding the conductors of a train operator's conductors and conductors in the event that a passenger touches an exposed buzzer cord?

To paraphrase the words of Anglin, J. in Nelson v. C.P.R. 1917 CanLII 80 (SCC), [1918] 2 WWR 177, at 187, 55 SCR 626, carriers of passengers are not entitled unnecessarily to expose their patrons to dangers which they can escape only by constant vigilance or unfailing alertness. Precautions are not required for the superhumans who are never preoccupied and never unwary. In determining whether the exposed buzzer cord in question was dangerously close to the track on which the door rollers ran or was a danger to the fingers of those who might be anticipated to reach for it for the purpose of calling the conductor's attention to their desire to dismount, the human element and the ordinary passenger's reaction must be taken into account. If tested by that standard the position of the exposed buzzer cord involved a peril to the passenger, the existence of which was neither necessary nor sanctioned by legal authority, negligence in so maintaining it in my opinion cannot be gainsaid.