(c), with such amounts to remain available to the Secretary until expended, without further appropriation. (e) Definitions In this section: (1) Long Bridge Project The term Long Bridge Project means the project consisting of improvements to the Long Bridge and related railroad infrastructure between Rossyln (RO) Interlocking in Arlington, Virginia, and L’Enfant (LE) Interlocking near 10th Street SW in the District of Columbia, the purpose of which is to expand commuter and regional passenger rail service and provide bicycle and pedestrian access crossings over the Potomac River. (2) Secretary The term Secretary means the Secretary of the Interior, acting through the Director of the National Park Service.