Our new ticket system has not even started yet, but it is not uncommon to see a ticket scanning machine out of order. Bit of a worry when they go out of order without ever being used.
I phoned the friendly team at Myki yesterday to enquire about the logistics of 40 people scanning off a tram and 50 scanning on at the same stop. The question must have been asked already as the response was well rehearsed. Multiple doorways, multiple scanners, takes no time at all lalalala.