A fourth known trolleybus turntable was one used on the Guadalajara trolleybus system in Mexico in the 1980s, in a since-closed trolleybus-only tunnel in the city centre, on a temporary basis in 1982–1983 and again from 1985 until early 1988 (when the tunnel closed for the start of work to convert it for use by Guadalajara's light rail system).
Guadalajara | operating system | Super Nintendo Entertainment System | Nintendo Entertainment System | Android (operating system) | Guiding Light | British Rail | Global Positioning System | Rail transport | Solar System | X Window System | Electric Light Orchestra | light rail | Edmonton Light Rail Transit | Network Rail | rail | Korean Broadcasting System | light curve | System of a Down | rail trail | Domain Name System | Seoul Broadcasting System | North Carolina Community College System | Light-emitting diode | Mutual Broadcasting System | Bulletin board system | system | light novel | Charge of the Light Brigade | Turner Broadcasting System |