Superliners on NEC

Superliners cannot be used on the Northeast Corridor for several reasons: - They are too tall for the tunnels under the Hudson River to Penn Station New York. - Amtrak uses mostly high level platforms on the NEC; Superliners are designed for low level platforms and can't use high ones. - They won't fit through the tunnels at Baltimore (at both ends of the station). - There are several places where the catenary is too low to clear Superliners.

At Washington Union Station, one or two tracks have high catenary wire so Superliners can reach the station and maintenance facilities.