i picked up this circus circus shuttle keychain. i see the elevated rails and the tram car everyday but i could not recall a time when it was operational. a quick google search yielded this result:
https://www.lasvegasadvisor.com/question/circus-tram/

https://www.ebay.com/sch/stiv17/m.html?item=293068030512&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562