amtrak
n. uncountablen. the national train system in the United States. You use this name when talking about traveling between American cities by rail.
n. the brand name for the National Railroad Passenger Corporation, which operates intercity passenger train service in the United States.
I am taking Amtrak from New York to Washington tomorrow.
Traveling by Amtrak is often slower than flying, but it offers more legroom and scenic views of the countryside.
The expansion of Amtrak routes remains a central topic in debates regarding American infrastructure and the reduction of carbon emissions through public transit.
When used as a proper noun, it is typically not preceded by an article.
I took the Amtrak to Boston.I took Amtrak to Boston.As a proper brand name, it is usually used without the definite article 'the'.