encyclopedia

LINE

The horizontal alignment of the rails. Also a verb indicating the act of moving track or correcting irregularities in alignment.

LINE CAPACITY

The number of vehicles per unit time, or passenger per unit time, that flow in one direction between two points along a line.

LINE HAUL SERVICE

1. Transportation service along a single corridor, without branches, with stops along the way. Usually service is intensive (high capacity) and uses exclusive right-of-way. 2. May also be used to describe express service or even main-line service, as opposed to…

LINE MILES (LINE KILOMETERS, MILES OR KILOMETERS OF

The sum of the actual physical strength (measured in only one direction) of all streets, highways, or rights-of-way traversed by a transportation system (including exclusive rights-of-way and specially controlled facilities), regardless of the number of routes or vehicles that pass…

LINE SUPERVISION (AUTOMATIC TRAIN CONTROL)

The subsystem within the automatic train control system which monitors the system status and provides the appropriate control to direct the operation of the train in order to maintain intended traffic patterns and minimize the effect of train delays on…

LINE SUPERVISION (COMMUNICATIONS)

The monitoring of a line (circuit) to determine the state of its integrity and ability to perform in its prescribed manner.

LINE TERMINAL

The extreme ends of a line where layover is provided for.

LINEAR ELECTRIC MOTOR (LEM)

An electric motor that produces mechanical force through linear, instead of rotary, motion. It is chiefly used for propelling vehicles along a track or other guideway. (TRB)

LINEAR INDUCTION MOTOR (LIM)

An asynchronous alternating-current motor composed of a winding in the guideway and a winding in the vehicle, one of which is energized to produce opposing magnetic fields that propel by alternately attracting and repelling the vehicle. Also see Motor, Double-Sided…

LINEUP

Scheduled connections between two or more lines. In MTA practice, refers to the hourly line up of owl service in downtown Los Angeles along 7th Street and along Broadway on blocks near this intersection. Owl service connections also are scheduled…