Union Station is the city's main train station and services approximately 70,000 people each day. It is Amtrak's second-busiest station with 4.6 million passengers annually and is the southern terminus for the Northeast Corridor and Acela Express routes. Maryland's MARC and Virginia's VRE commuter trains and the Metrorail Red Line also provide service into Union Station. Following renovations in 2011, Union Station became Washington's primary intercity bus transit center.