 This meant that one could stop part-way through a journey and then continue, or even make a round trip, without paying multiple fares.From December 14, 2015, until the September 3, 2017, passengers who paid by cash or token were required to obtain a time-based paper transfer as a result of the proof-of-payment (POP) system that had come into effect on all TTC streetcar routes as passengers could have been asked at any time to show POP.At the time, the Presto card readers on the 512 cars were not configured to handle this special route-specific time-based transfer pilot scheme.