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This is a list of the power supply systems that are, or have been, used for tramway and railway electrification systems. Note that the voltages are nominal and vary depending on load and distance from the substation. Many modern trams and trains use on-board solid-state electronics to convert these supplies to run three-phase AC induction motors. ==Key to the tables below== * Volts: voltage or volt * Current: * * DC = direct current * * xx Hz = frequency in hertz (alternating current (AC)) * * * AC supplies are single-phase, except where marked three-phase * Conductors: * *overhead line or * *conductor rail, usually a third rail to one side of the running rails * * * Conductor rail can be: * * * * top contact: oldest, least safe, affected by ice, snow and leaves * * * * side contact: newer, safer, less affected by ice, snow and leaves * * * * bottom contact: newer, safer, least affected by ice, snow and leaves 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of current systems for electric rail traction」の詳細全文を読む スポンサード リンク
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