Unlike airlines, the company has had little visible increase in security since the September 11th terror attacks in 2001. But concern about Amtrak security has mounted since the 2004 train bombings in Madrid.
Experts say rail systems need completely different security measures than airlines because they move many more people and are designed to be open systems.
Amtrak says the new measures draw heavily from those already in place for subways in New York City, and won't hold up the flow of passengers.
Amtrak plans to roll out "mobile security teams" in the Northeast corridor -- between Washington and Boston -- before expanding them to the rest of the country.
