Glenmont is the only station on the Red Line to feature the six-coffer arch design, which is also seen on the Green Line. It is also unique as the only underground terminus station in the Washington Metro, and until 2006, it was also the only station in the system lit with sodium lamps. These lamps gave the station a warm orange glow and were later replaced with the mercury vapor lamps found in other underground stations. The Glenmont rail yard is located just beyond this station and has the ability to store 132 rail cars.