Page 49777 of Volume 62 of the Federal Register (published September 23, 1997) contains a section regarding proposed by the Federal Railroad Administration. Here is a relevant piece of text from that page:
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"They believe that observation of brake indicators does not give a reliable indication of effective brakes because the indicators only show that the brake cylinder has moved and not that the brake shoes are applied against the wheel with sufficient force." Page 49777 of Volume 62 of the Federal