The History and Modeling of Interurban Railroads | St. Louis ...

Additionally, some lines consisted entirely of a loop around a particular area, which allowed cars to circulate around, for example, an entire shopping district. Systems rarely owned more cars than required by rush hour, so only a minimum ... As common as this method remains, maintaining the wire in the center of the tracks required not only diligent maintenance but also clever mathematics and engineering. A second manner of powering cars and motors utilized a third rail. ...