[CBQ] Signal Question

["Bob Campbell via groups.io" <amtrak347=aol.com@groups.io>]

Nelson, Glen -

 

I believe the NB, SB designations refer to non-absolute signal number plates on such intermediate signals ("N" being a signal on the north side of the governing track and "S" being for the signal on the south side).  As I recall, all intermediate signals on the C&I (3rd Subdivision) had either a "N" or "S" pre-fix to the numeric signal number (representing the approximate MP location down to the tenth of a mile).  Since the last digit of the signal number is the tenth of a mile designator, there's no need for a "N" pre-fix (odd number for westbound trains) nor an "S" pre-fix (even number for eastbound trains).  In later years, the "N" and "S" designations were dropped from the non-absolute signal's number plates.

 

Bob Campbell

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