The Tren Urbano is a single, 10.7-mile (17.2 km) with 16 stations. Four stations are at grade or in an open cut, two are underground, and the rest are on elevated structures. Each station has unique artwork. The system is served by a fleet of 74 Siemens built vehicles that use automatic train operation. Approximately 43,000 people use the system daily. Unlike the accompanying AMA bus system, Tren Urbano operates seven days a week.