I don't think they take call in reservations, but you can try. That one in Harriman moves folks along pretty quickly though, you won't have to wait long even when they are really busy.
I would assume that you can call ahead and let them know how many people to hold a table for I have never tried
They don't officially take reservations, but if you have a large group they would like the call ahead of time, but mind you they handle buses without a call
Yes you can call and make reservations for large groups
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