encyclopedia

F END

Front end of a heavy rail vehicle containing the train operator’s cab.

FACING MOVEMENT

The movement of a train over the points of a switch which faces the approaching train. See also Trailing Movement.

FACING POINT SWITCH

A track switch the points of which face toward approaching traffic. (NTSC)

FACTOR ANALYSIS

An analytical technique for identifying the major interrelationships between variables, frequently used in transportation demand analysis. (TRB)

FAIL OPERATIONAL

A characteristic design which permits continued operation in spite of the occurrence of a discreet failure. (NTSC)

FAIL OPERATIONAL FAIL SAFE

A system characteristic which permits continued operation on occurrence of a failure while remaining acceptably safe. A second failure results in the system remaining safe, but non-operational. (NTSC)

FAIL-SAFE DESIGN

A design principle in which each of the elements which make up a system is analyzed to determine the potential consequence of failure of that element, alone or in combination with any or all other elements of the system, to…

FAIL-SAFE SAFETY

A characteristic of a system and its elements, the object of which is to ensure that any fault or malfunction will not result in an unsafe condition. (NTSC)