The term GO BY AMTRAK can be summarized by the solution to the crossword puzzle, which is RIDE. Amtrak is a passenger railroad service that operates throughout the United States and is owned by the U.S. government. It provides intercity transportation services, connecting more than 500 destinations in 46 states and three Canadian provinces. Amtrak offers a variety of services, including long-distance routes, regional services, and commuter rail services. Going by Amtrak is a convenient way to travel between cities, and the term GO BY AMTRAK can be summarized by the solution to the crossword puzzle, which is RIDE.