e/Stud contact system

Information
has gloss	eng: The Stud Contact System is a once obsolete ground-level power supply system for electric trams. Studs were set in the road at intervals and connected to a buried electric cable by switches operated by magnets on the tramcars. Current was collected from the studs by a "skate" or "ski collector" under the tramcar. The system was popular for a while in the early 1900s but soon fell out of favour because of the unreliability of the magnetic switches. However, the new tram system in Bordeaux, France has resurrected the system in the form of alimentation par sol for aesthetic reasons in the city centre.
lexicalization	eng: Stud contact system
instance of	c/Rail technologies