Category: Rail Operations_Construction

ABOVE GROUND STATION

A station in which the tracks and platform are either located on an aerial structure or rest directly on grade.

AERIAL CONFIGURATION

An assembly of construction components elevated above the adjacent natural ground level, usually supported by columns.

AERIAL STRUCTURE

Any system structure or configuration, other than a culvert, which carries tracks and spans above an earth or water surface.

ALARM SIGNAL

A signal for attracting attention to some abnormal condition.

ANCILLARY FACILITIES

Support system for a rail line, such as power and electric equipment.

ARCADE ENTRANCE

An entrance to a below ground station with the head of the stair or public sidewalk and the stair run within a private building structure.

AT GRADE

At natural ground level when describing transitways or streets; the intersecting transitways and streets are at the same elevation and actually intersect. (Grade crossings that are not separated.)