S
WAlstom APS
WBow collectorA
WBrecknell Willis high reach pantograph
WConduit current collectionB
WGanz CSMG
WGanz MFAVC
WGanz UV
WGround-level power supplyD
WMekarski system
WPantograph (transport)E
WReserved track
WTram engineF
WTramway track
WTrolley pole