The term SUBWAY SYSTEM EXTREMES is composed of two crossword solutions, TERMINI (7 letters) and Extremes (7 letters). TERMINI refers to the endpoints of a subway system, while Extremes refers to the farthest points of the system. TERMINI are usually the first and last stops on a subway line, while Extremes are the furthest points from each other that the subway system reaches. This term is often used to describe the size and scope of a subway system, as well as its reach and coverage.