Muni has just implemented all-door boarding, the first system in the country to do so. That includes F-line streetcars. People with cash must board at the front door, but those with Clipper cards, Muni Passports, or valid transfers (any proof of payment) can board (legally) at the back doors.
Muni has even created a video outlining the basics of the new system, with enough old photos of buses and streetcars to make it worth looking at just for that.
As SFTMA transit chief John Haley told the Chronicle, it’s too early to judge how well it’s working. We have our volunteer docents out and about giving people information about how to use the new system at key F-line stops. We’ll report anything we learn of interest here.