List of rail transport systems using third rail

Third rail railways predominantly operates in urban areas. Notable exceptions are (or were) mainline electrics of the former Southern Region of British Railways and a few interurban railways in the US. In Europe top contact third rail tends to be limited to early electrified urban railways (the current conductor is normally left naked on top), contrary to North America where it usually has a protecting cover.

Source: Wikipedia — List of rail transport systems using third rail (CC BY-SA 4.0)