Re: (erielack) Erie Signals

[Jim Guthrie <jguthrie_@_pipeline.com>]

>A generalization to all, is that signals and signal systems are like  
>studying track charts.   It all depends on a particular date and  location.  I've 
>looked at Lackawanna track diagrams over the years and  constantly found 
>new signals replacing old signals and usually not at the same  locations.  

One of the neat things that some maps include -- but not many, are the descriptions of the signal indications and available aspects gor an interlocking. It's nice to see the signals; nicer to see the available aspects -- and terrific whenm one includes the list of movements and conditions for each signal.swicth.

Cheers,
Jim Guthrie

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