Another view of the interior of the Park Street station, around 1898. Photo from The New England Magazine, Volume 25, Issue 5.
The station in 2015:
This photo was taken just across the center tracks from the photos in this post, standing on the edge of the outbound platform facing in the inbound direction. The stairs in the very distance, which lead up to Boston Common, are the same ones visible in the other post.
As mentioned previously, Park Street is one of the two oldest subway stations in North America, having opened in 1897. Today, the Green Line platform configuration remains mostly the same, with two island platforms surrounded by tracks on both sides. The two center tracks lead to a turning loop, which can be used by inbound trains to reverse direction. Both tracks along the outbound platform are served by all trains; Boston does not have express trains.