A process that involves random variables and a nonreproducitible output. Also see Deterministic Process. (TRB)
A probabilistic trip assignment technique that allocates trips with deviation from the minimum time route on the basis of differences in travel times. (TRB)
The rail against which the point of a switch, derail, or movable point frog rests.
A signal indication to stop and then proceed with certain cautions not to exceed a designated speed. Also see Operating Modes (Light Rail). (NTSC)
A signal which displays the most restrictive aspect indicating stop. (NTSC)
Time on a trip spent stationary because of the stoppage of other traffic. (TRB)
An operator’s regular work, consisting of one uninterrupted assignment paying eight ours or more.