Answer: pantograph

AnswerCrossword Clue
PANTOGRAPHElectric-locomotive trolley
pantographA jointed framework conveying a current to a train, streetcar, or other electric vehicle from overhead wires
pantographAn instrument for copying a drawing or plan on a different scale by a system of hinged and jointed rods
pantographa jointed framework of rods, based on the geometry of a parallelogram, for copying drawings, plans, etc also PANTAGRAPH