What is the wire that comes in contact with the pantograph called?

The wire that comes in contact with the pantograph is correctly referred to as the Trolley or Contact Wire. This wire is crucial in the operation of electric trains, as it carries the electrical current necessary for powering the train's motors. The pantograph, which is a device mounted on the roof of electric trains, is designed to maintain contact with this wire while the train is in motion, allowing for a continuous supply of electricity.

Each option represents components associated with train and trolley systems, but the Trolley or Contact Wire specifically refers to the wire that directly interfaces with the pantograph. The other types of wires mentioned serve different functions; for instance, a Pan Wire typically relates to the structural element that supports the pantograph but is not the conductive wire itself. Auxiliary Wire might refer to additional wiring used for signaling or other support functions. Messenger Wire is supportive infrastructure that can hold up the contact wire but is not involved in electric conduction directly. Understanding this terminology is key for those working in rail operations, as it helps clarify the responsibilities and functions of various train components.