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From www.hosam.com: ACI(Automatic Car Identification)plates were mandated by the F.R.A. in 1968 and were to be installed on all equipment by 1970. They were abandoned as impractical in 1978. After 1978 the plates could be removed, but many were never removed. As the equipment passed by the trackside scanner it was scanned. All information necessary to keep track of the engine or car was then sent to a master location where it was logged. Dirt, scratches, fading from sunlight and vandalism all contributed to the eventual failure of this system. Placing these on your models will tie them to the post 1968 period. What do the little stripes mean? http://www.nakina.net/aci.html
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