Maybe someone might be able to comment on whether the old HARVARD unloading area for the trolley (and bus) was fare controlled. I never exited that way but I do remember boarding the trackless trolley inbound on the surface and the driver said, "pay in the station." This fit perfectly with the free transfer policy back then and also fits with the 72 line using the left side doors on the Aberdeen Ave. median. In the latter case it would be pay exit inbound and pay enter outbound. For taking the train, it also worked because I paid the one and only fare at the turnstiles for the train.
There must have been guards to keep bus passengers exiting at Harvard from going down the ramp almost to the train turnstiles and do an about face and go up the down staircase there to evade the fare! (I'm pretty sure that the stairs facing the Harvard Coop had separate wide in and out sections next to each other.
And does anyone remember whether the bus platform stairs to the outside came up into the same middle-of-the-square kiosk and up facing Harvard Yard (east)?
In the early 1960's transfers almost system wide were abolished and the buses in and out of the Harvard tunnel became pay enter inbound and pay exit outbound.
Build something. Anything.