The inaugural <i>Prairie Marksman</i> (actually a borrowed <i>Prairie State</i> set) at East Peoria on a demonstration run in August 1980
John Kuehl
<a rel="nofollow" class="external text" href="http://history.amtrak.com/archives/i-amtrak-news-i-september-october-1980">Amtrak NEWS, September/October 1980</a>