Cass Photo Special - Blu-ray During the month of May, the Mountain State Railroad and Logging Historical Society holds its annual Cass Railfan Weekend. This video includes action from the 2011 and 2012 weekends. Sit back and enjoy as the Shay #4, #5, #6 and #11 put on a show you won't soon forget. The clear whistles and magnificent smoke plumes will bring a smile to your face as the powerful locomotives climb up grades and back up, showing off their grandeur. No music, subtitles or commentary detracts from the pure mountain railroading. 38 minutes.