Park St. contains four active tracks. It is
customary for travelers to step across the rails as necessary to move
between the platforms.
Westbound, only one other station dates, like
Park St., to 1897: Boylston. The subway turns under Bolyston St. After the Copley
station, Heath St. (E) branch trains
split off in a wonderfully visible underground junction. The three other branches
head on to the four-tracked Kenmore station, after which each
reaches the surface through its own portal.