The term METROLINER ALTERNATIVE is referring to the ACELA, a high-speed train service operated by Amtrak that runs along the Northeast Corridor between Washington, D.C., and Boston. The ACELA is an alternative to the Metroliner, which is a regional train service that operates on the same route. The ACELA is faster than the Metroliner and offers more amenities, such as Wi-Fi and power outlets.