Once you get off the greyhound bus, take the stairs to the very next floor, then follow the signs for the subway trains. You can get the 2 train, from there you will be able to connect to the 6 train depending on where you're headed-uptown or downtown.
# 2 train is connected 2 the port authority. Follow the signs. The same goes 4 the # 6 train, but u must/can connect 2 it via the shuttle train 2 Grand Central Station. Again, follow the signs.
Not sure. Sorry
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