I wonder how that would compare with Canadian systems which all run on POP (even the poor service West Coast Express and Montreal EXO). How do they have two person crews though? GO Transit needs two crew members in the cab plus a third (customer service ambassador) to open the doors.
GO has two in the cab? Is that a legal requirement or just operating procedure? The standard for American commuter rail is one in the cab (engineer) and one in the passenger cars (conductor) plus possibly an assistant conductor or additional ticket checkers. (The conductor is legally required)
American freight has two in the cab but one is the engineer and one is the conductor.
One crew member in cab and one crew member working doors.