Car 172 is a Brill semi-convertible design, meaning the windows can be raised into roof pockets. This creates an open summer car effect with the convenience of being able to lower the windows in case of a rain storm or cool weather.
Car 172 is our example of a Toonerville trolley, a small two-axle trolley. The nickname comes from a series of silent comedy films by that name, which featured a rickety little trolley bouncing along the countryside as its motorman engaged in a series of comical adventures. Car #172 is based on a design by J. G. Brill Co. of Philadelphia, which is coincidentally where the first Toonerville trolley movies were made, before Hollywood even existed.