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The article describes the code and the rolling stock side of the system, but what about the readers? Where were they placed, how did they look? How did they work? B/W cameras with color filters, color cameras, photocells with color filters? What kind of systems were attached to the readers? Was there a central entity for number assignment or was this handled by each RR company separately? What was the system-level goal of the whole system? Was it to know where rolling stock was located, was it for facilitating maintenance and lifecycle management? --Himbeerkuchen (talk) 10:51, 29 April 2020 (UTC)
The picture at the top of the article of an actual KarTrak plate seems to disagree with the diagram further down which outlines the various bars allowed. For example, the STOP codes are inverted, and the first digit is an 8 which according to the text doesn't make sense. Clearly there is a lot of information missing here, someone should get that guy who knows a lot about barcodes [1] to check this page out. /-\urelius ♠ |)ecimus What'sup, dog? 14:14, 19 April 2015 (UTC)
Find some references there including patents views and also supposed to be true historic data sets: https://www.youtube.com/watch?v=5K8UpMNYIPo
This still might be interesting or helpful to include in the article:
--Alexander.stohr (talk) 20:12, 26 February 2023 (UTC)
David Collins holding a ~10min speech at a TEDx event: https://www.youtube.com/watch?v=trtuf_iX1lM --Alexander.stohr (talk) 23:27, 26 February 2023 (UTC)
The Barcode article had those extra(?) line and reference: "Light reflected off the colored stripes was read by photomultiplier vacuum tubes.[1]" It might be useful for the article. --Alexander.stohr (talk) 21:13, 26 February 2023 (UTC) Alexander.stohr (talk) 21:13, 26 February 2023 (UTC)
References