N&W intermediate signals

NW Mailing List nw-mailing-list at nwhs.org
Wed Nov 16 08:41:13 EST 2016

Jim -

Since the signals at control points (ends of controlled sidings, power crossovers in double track, etc.) would be at “stop and stay”, the signals in advance would be “approach”.  The ones in advance of those would be at :”clear”.    In some rare instances the signal in advance would be at “advance approach” – the signal on the Columbus District coming down into the Cincinnati District junction at Vera, for instance.

When a route was lined up for a train, all the opposing signals would go to “stop” and the signals in advance of the controlled point would go to “clear”, or “approach medium” if a diverging route was lined up,

This was true of the pre-CPL position light signals, too.


From: NW Mailing List 
Sent: Wednesday, November 16, 2016 7:26 AM
To: NW Mailing List 
Subject: N&W intermediate signals

What was the "default" aspect for N&W CPLs in the absence of traffic?  Since they ostensibly simply indicate block occupancy, it would seem that if there were no trains, all intermediates would be showing CLEAR, but somehow this doesn't "feel" right to me.  If I had had the foresight to go out along the line on a Christmas day in the 70's and examine the state of intermediate signals, would I have seen all green? 
Jim Cochran

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