| 摘要 |
A trolley wire overhead electric supply system, for supplying power for the propulsion of electric vehicles, comprises a contact wire which is directly supported at each supporting mast through a spring. The spring is associated with an abutment so arranged that for an upward force below a predetermined value acting on the spring through the contact wire, the contact wire is relatively stiffly connected to the mast and, for an upward force above said predetermined value acting on said spring through said contact wire, the contact wire is relatively softly connected to said mast.
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