only 25 kV 60 Hz AC electrification, two center opening high level doors per side, less powerful traction motors, full-width cabs, and bells. Electromagnetic interference Some users of audio equipment have found that the presence of tracks carrying Silverliner V cars have introduced detrimental electromagnetic interference to playback and recording of audio. This phenomenon also affects audio and PA electronics inside the cars, although Hyundai Rotem has fitted filters to lessen the effect on internal equipment. References External links Silverliner V RFP Technical Specification SEPTA Silverliner V Page Image of the operating cab RTD Variant Fact Sheet SEPTA Regional Rail Passenger rail transportation in Pennsylvania Rail passenger cars of the United States Train-related introductions in 2010 Electric multiple units of the United States Hyundai Rotem multiple units RTD commuter rail 25 kV AC multiple units