Define the following words or terms (from the Glossary) as used in the Operating Rules (Chapter 1 through 17).


a. Automatic Block Signal System (ABS)


b. Block


c. Block Signal


d. Centralized Traffic Control (CTC)


e. Control Point


f. Current of Traffic


g. Distant Signal


h. Dual Control Switch


i. Interlocking


j. Interlocking Limits (Although there is no definition for Control Point Limits, this definition also applies at Control Points)


k. Reverse Movement


l. Signal Aspect


m. Signal Indication


n. Trackside Warning Detector


o. Track Warrant Control (TWC)


p. Train Coordination


q. Yard


r. Yard Limits