Key:contact_line

Along the overhead wires that power trains, trams and trolleybuses, there are spatially confined features for operation, maintenance and safety. contact_line=* should be used on nodes or short ways, unlike tags such as frequency=* and voltage=* which apply to longer sections of the overhead wire. Features are placed on ways or are ways with electrified=contact_line or trolley_wire=*.

Tag	Comment	Details
contact_line=section_break	Usually a place of electrical separation. Vehicles may briefly connect sections.	Wikipedia
contact_line=phase_break	Always a place of electrical separation. Only applicable for alternating current.	Wikipedia
contact_line=system_change	Always a place of electrical separation. Change within/between AC, DC or (national) railway electrification systems.
contact_line=supply	A place where power may be supplied.
contact_line=grounding_switch	A place where the overhead wire can be temporarily grounded during maintenance by a permanent mechanism.
contact_line=junction	A junction that allows the overhead wires of at least two different systems to cross/merge at similar height.	Wikipedia
contact_line=tensioner	Where automatic/constant tensioning happens.	Wikipedia
contact_line=joint	Place where two wires have been spliced together.