Take AMTRAK directly to New Rochelle, NY. Then either walk or take a cab to the Marriott Residence Inn hotel at New Roc City. If walking, go to North Ave.; turn right; walk about 1/2 block to Huguenot St. (see the Post Office bldg.); turn left; walk one block; turn right and Residence Inn is on the left hand side of the street.
The Radisson Hotel is a bit farther from the train station, so you might want to take a taxi.
IF YOU CANNOT BOOK AMTRAK TO NEW ROCHELLE:
Take AMTRAK to Penn Station, New York City. Take the 1, 2, or 3 Subway line (runs 24 hrs.) to 42nd St., Times Square.
Take the "S" shuttle to Grand Central Station to take the Metro North Railroad to New Rochelle. Go to the window and buy your ticket BEFORE you get on the train. It's much more expensive when you purchase it on the train.