Illinois Railway Museum has a diverse fleet of electric trolleybuses, and this one (coach #4020) is the largest of them. King County Metro of Seattle took delivery of these 60-foot M-A-N buses in 1987, and retired them in mid-2007. They ran on the 5 longest and most heavily-travelled trolley routes in Seattle. I rode this bus when it was in service in Seattle, so getting the chance to ride it was a little nostalgic.