Manual Block System
A series of consecutive blocks, governed by block signals operated manually, using information by telegraph, telephone or other means of communication.
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Manual Block System A system where an area of trackage used to operate trains in both directions on a single track that is not controlled automatically through a signaling system.
In earlier Conrail days that used manual block system rules. When the NORAC rulebook came into being MBS was replaced with form D rules. The form D is akin to a track warrant.
 See also: Operation, Track, Train, Schedule, Main Track
  
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