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Most methods include things like a brake to prevent the wires from unravelling entirely if a wire breaks or tension is shed. German programs generally use a single substantial tensioning pulley (fundamentally a ratchet mechanism) that has a toothed rim, mounted on an arm hinged for the mast. Normally the downward pull with the weights as well as re

[nine] Once the overhead line was lifted inside the Simplon Tunnel to support taller rolling stock, a rail was utilised. A rigid overhead rail may also be Utilized in sites in which tensioning the wires is impractical, for example on moveable bridges. In present day utilizes, it can be very common for underground sections of trams, metros, and main