Select the 'Wire Manager' button from the Linear Draft toolbar and the 'Wire Manager' form will be displayed.
Select the wire that you want to rename form the 'Selected Wire' drop-down menu and click 'Edit'.
The 'Configure' form will be displayed. The 'Configure' form will be different for catenary and auxiliary wires.
Delete the current wire name and type the new name.
Click 'Confirm' to accept.