encyclopedia

DEPARTMENT OF TRANSPORTATION

Federal agency established by an act of Congress on October 15, 1966, commencing operation on April 1, 1967. The Departments mission is to serve the United States by ensuring a fast, safe, efficient, accessible and convenient transportation system that meets…

DEPENDENT FAILURE

A failure which occurs as the consequence of another failure.

DEPENDENT PAIR

On the Red Line, “A” and “B” cars semi-permanently coupled together to form a single operating unit.