> Warning: choo choo nerd talk! Actually, at Park Street and Government
> Center (the most Embarcadero-analogous places where most services on
> the Muni-metro-analogous Green Line turn back) trains reverse by
> running around a balloon loop and immediately reappearing on the
> outbound platforms. (Non-revenue balloons are also used at some outer
> terminals.) The high-platform, more-subway-like Red and Orange Line
> trains reverse at the platforms of their two-track, stub-end terminals
> rather than using the tail tracks. Only at the Wonderland end of the
> Blue Line do trains regularly reverse in the tail tracks (the Bowdoin
> end runs around the to-be-closed non-revenue balloon.)
Would you believe that those balloon tracks in Boston were built in 1897! A
hundred years ago someone knew how to do it effectively. cm