Servicio de Transportes Eléctricos de la Ciudad de México (STE) (Spanish for Electric Transport Service of Mexico City) is a public transport agency responsible for the operation of all trolleybus and light rail services in Mexico City. As its name implies, its routes use only electrically powered vehicles. It was created on 31 December 1946 and is owned by the Mexico City government. STE is overseen by a broader Federal District authority, Secretaría de Transportes y Vialidad (STV, or Setravi) (Secretariat of Transportation and Highways), which also regulates the city's other public transport authorities, including Sistema de Transporte Colectivo (STC, the Mexico City Metro system), Red de Transporte de Pasajeros del Distrito Federal (RTP, diesel bus network) and Metrobús, as well as othe