 Pantograph rail: Encyclopedia II - Pantograph rail - List of metro systems using pantographsMost metro systems are powered by a third rail, but some use pantographs, particularly ones that involve extensive above-ground running. (Hybrid metro-tram or 'pre-metro' lines whose routes include tracks on city streets or in other publicly-accessible area must of course use overhead wire, since a third rail would present too great a risk of electrocution.)
Among those metros which use pantographs are the following:
Bucharest Metro - Bucharest, Romania - Trains are mounted with pantographs which are only used in yards. O ...
See also:Pantograph rail, Pantograph rail - List of metro systems using pantographs Read more here: » Pantograph rail: Encyclopedia II - Pantograph rail - List of metro systems using pantographs | 
