generate questions: Union Station is further served by four Amtrak lines: the Northeast Regional and the high-speed Acela Express provide service to New York, Washington, D.C. and Boston, and rank as the first and second busiest routes in the country; the New Haven–Springfield Line provides service to Hartford and Springfield, Massachusetts; and the Vermonter provides service to both Washington, D.C., and Vermont, 15 miles (24 km) from the Canadian border. Amtrak also codeshares with United Airlines for travel to any airport serviced by United Airlines, via Newark Airport (EWR) originating from or terminating at Union Station, (IATA: ZVE).
How many Amtrak lines service Union Station? {sep_token} Which transit lines out of Union Station are ranked as the busiest routes in the U.S.? {sep_token} Which transit line out of Union Station provides service to Hartford and Springfield, Massachusetts? {sep_token} Which transit line out of Union Station provides service between Vermont and Washington D.C.? {sep_token} With what airline does Amtrak codeshare for transit to Newark Airport that originates or terminates at Union Station? {sep_token} What is the name of the train station within New Haven? {sep_token} The train line that connects Connecticut, Massachusetts and Vermont together is known as what? {sep_token} In additions, the train line is also connected with which airline services? {sep_token}