Automatic Block Signals - 1907

NW Mailing List nw-mailing-list at
Fri Jul 31 18:35:10 EDT 2020

I have attached a low-resolution scan of a 1907 N&W Instructions for Automatic Block Signals (ABS) and Interlocking Signals.  My questions are: 1) Is this the earliest ABS instructions issued by the N&W?  If so, then 2) where was the first installation?

Good evening,

Frank Scheer
f_scheer at
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