They are constructing a connection between the A/C/F Jay Street Station and the M/R station down the block. Construction on the passageway can be seen at night directly across from the MTA Building on Jay Street, its a pretty busy operation. They are also running the track inspection car a whole lot around the Jay street station. I saw it last week TWICE and again today at 10:45AM. Its really a beautiful piece of machinery.
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"Please stand clear of the closing doors. Next stop, uh... Franklin... naw, that's not it. Well, let's go."