encyclopedia

POCKET TRACK

Designated tracks auxiliary to the main line for storing rail vehicles and turnbacks.

POINT DEVIATION SERVICE

Public transportation service in which the transit vehicle is required to arrive at designated transit stops in accordance with a prearranged schedule but is not given a specific route to flow between these stops. It allows the vehicle to provide…

POINT OF CONVERGENCE

The location at which two transit routes meet and then continue on the same alignment. (TRB)

POINT OF DIVERGENCE

The point at which two transit routes separate after operating over the same alignment. (TRB)

POINT OF INTERSECTION

The point at which one transit route crosses or abuts another route. (TRB)

POINT OF PRESENCE

An Internet service provider’s dial up connection for modem users, used particularly to describe local connections so that users don’t have to dial long distances. For example, a particular Internet Service Provider (lSP) might be based in San Jose, but…

POINT TO POINT PROTOCOL

Dial-up Internet connection speaking in Transmission Control Protocol/Internet Protocol (TCP/IP), somewhat faster than Serial Line Internet Protocol (SLIP). Also see SLIP (Serial Line Internet Protocol).

POINT-TO-POINT DEVIATION

A transit routing pattern in which the vehicle passes through prespecified points in accordance with a prearranged schedule but is not given a specific route to follow between these points. It may provide door-to-door or curb-to-curb service. Also see Service,…

POINTER

An address (URL) embedded in data that specifies the location of data in another record or file. A hyperlink is an example of a pointer.