I take the train to NYC for business and usually leave from the New Brunswick station. If I don't want to call a friend to get a pick up I can go right outside the train station and get a cab at Black and White taxi. They are not quite like you would get in the city. You will often have to wait for a taxi to get back to the office and they may take more than one patron at a time but they are a lot easier than calling a cab from somewhere else and waiting outside for it to come.
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