On page 66 of Lionel's vol.2 - 2018 catalog is a new item #1929100, Defect Detector. While Lionel claims this came about during the 1940's can anyone supply information on what railroads, if any, actually used a system such as this, and in what parts of the country? How widely was it used and how prototypical is Lionel's design to how the actual facilities looked and operated. Was this a "for real" necessity used by many railroads or an oddity used on just a few rail lines? Also, are any of you planning to add this to your layout?
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