When looking at bus service, I found out that medford has one more bus than I thought it did: bus 710. Looking more, I found two other such busses: 712/713 in winthrop, bus 714 in hingham and bus 716 in canton. Apparently these are run by private carriers with subsidy from the mbta. They take mbta passes in non charlie-card form (except the 712/713 which doesn't) and their maps (710, 712/713, 714, 716) look almost like mbta maps (a little sloppier, though). I wonder what the busses themselves look like?