A structure built to support the end of a bridge.
America's national rail operator.
The part of the bridge that carries traffic from land to the bridge structure. The span connecting an abutment with the main span of a bridge.
The geographic area within which a proposed project may directly or indirectly cause alterations in the character or use of historic properties, if any such properties exist.
A flat-bottomed boat for carrying freight, typically on canals and rivers, either under its own power or towed by another vessel.
A movable bridge that utilizes gears, motors and counterweights to pivot its span upward at an angle and allow waterway traffic to pass beneath the bridge.
An overhead wire that carries power to trains.
A watertight enclosure constructed in waterlogged soil and pumped dry so that construction can take place within a waterway.
A main supporting beam that carries a load along its length by resisting bending.
The ability to maintain train service on a limited number of tracks following an event that would have otherwise rendered all tracks inoperable.
The central support of a swing span around which the movable span rotates.
A construction staging strategy to shift traffic around the primary project location, resulting in no interruptions to traffic during construction.
A structure composed of slender members joined together at their end points.
A movable bridge in which both ends of the span are simultaneously raised vertically and whose movement is guided by towers located at each end of the span.