A "grip car" typically refers to the leading car of a cable car or streetcar system, which grips onto the track to provide power to the entire train. Synonyms for "grip car" may include "motor car," "propulsion car," or simply "lead car." Other related terms may include "trolley car" or "tram car," which refers to the entire train rather than specifically the lead car. Additionally, some regional variations may use different terms, such as "conductor car" or "controller car" depending on the specific functionality of the lead car in that particular system.