All models of bus vehicles may participate in this category provided that they are of a vintage, trolley or period style of bus. Many public and private fleet operators are finding that they can generate increased ridership through the ambience and character of these bus vehicles. Offerings of trolley models are presented by Cable Car Classics, Hometown Trolley, and Specialty Vehicles. 46 2017 Il l ustrated Gui de to N orth Ameri can B uses