KarTrak, a bar code system designed to automatically identify rail cars(en.wikipedia.org)
en.wikipedia.org
KarTrak, a bar code system designed to automatically identify rail cars
http://en.wikipedia.org/wiki/KarTrak
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This video about the Bus Electronic Scanning Indicator, from the late 1950's, might be of interest as well: https://www.youtube.com/watch?v=qGwZwe6izTg