third rail
noun[C]
uk/ˌθɜːd ˈreɪl/us/ˌθɝːd ˈreɪl/ametalbar,runningparallelwithtraintracks, thatsupplieselectricityto sometypesoftrain
(用以给电力火车输入电流的)第三轨,接触轨Railways: trains & parts of trains
- baggage car
 - bogie
 - boiler
 - boxcar
 - bullet train
 - caboose
 - carriage
 - choo-choo
 - coach
 - diesel
 - emergency cord
 - footplate
 - freight car
 - guard's van
 - maglev train
 - puffer train
 - rolling stock
 - sleeping car
 - truck
 - wagon-lit