What is the relationship between 'Northeast corridor' and 'Amtrak' in the context of the input sentence.
Options: member of, director/manager, owned by, chairperson

Gardner told lawmakers that it would cost Amtrak $1 billion per year just to keep its Northeast corridor infrastructure in a state of good repair, and would cost another $4 billion per year to complete its backlog of projects on the 457-mile corridor, a span that includes numerous century-old bridges and a 142-year-old tunnel.
owned by