. Electric railway journal . Rjukan Railway—Motor Car stalled on curves of 1640-ft. radius or less. All poles aregrounded and provided with a danger sign. In the twotunnels the contact wire is suspended from an intermediateinsulator which is attached to a rigid span member at in-tervals of 16 ft. 5 in. Each end of the span is attachedto an insulator, the arm of which is in turn anchored inthe walls of the tunnel. The catenary cable is carried over each bracket arm inthe groove of a porcelain double-petticoat insulator. An-chor poles for the catenary are installed at intervals ofabout 3300 ft.
. Electric railway journal . Rjukan Railway—Motor Car stalled on curves of 1640-ft. radius or less. All poles aregrounded and provided with a danger sign. In the twotunnels the contact wire is suspended from an intermediateinsulator which is attached to a rigid span member at in-tervals of 16 ft. 5 in. Each end of the span is attachedto an insulator, the arm of which is in turn anchored inthe walls of the tunnel. The catenary cable is carried over each bracket arm inthe groove of a porcelain double-petticoat insulator. An-chor poles for the catenary are installed at intervals ofabout 3300 ft. Special anchor insulators are located be-tween these poles and the overhead line. Three hand-operated tension take-up devices are also placed in eachanchorage section. -jj. •. Rjukan Railway—Construction in Tunnels and on OpenSingle Track Section insulators isolate the line into divisions about15,400 ft. long. In addition, the overhead line opposite eachstation can be cut out by circuit-breakers carried on the topof the poles. These breakers are operated from below by chains which are fastened to a lock mechanism on the postin such manner that they can be operated only by author-ized employees who are supplied with a key. All sectioninsulators are protected with a lightning arrester. The power supply is derived from a separate converterstation for each section of the line, as oniy 50-cycle, three-phase current at a pressure of 10,000 volts to 11,000 volts isavailable. The converter station which feeds the Vestfjord-dals railway is situated in Vestfjorddalen. It contains twoconverter sets, each of which consists of a three-phasetransformer which steps down the 10,000-volt pressure to500 volts and feeds an asynchronous motor driving an al-ternating-current
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