CSX Conductor
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1.	A block that may be occupied by only one train at a time. 
ANS Absolute Block 
2.	A color light color positon light or semaphore signal without a number plate a "P" marker, "APP" marker "C" marker or "G" marker that conveys stop as its most restrictive indication. 
ANS Absolute Signal 
3.	A railroad crossing at grade it is protected by signals which are actuated automatically by the approach of a train. 
ANS Automated Railroad Crossing 
4.	A block signal that is activated either by tr...