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Signal key switches
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Derail, английский
A specially shaped block placed over one rail of a siding to protect main line traffic from any runaway vehicles or unauthorised moves. this protection is achieved by derailing any locomotive or wagon that comes in contact with the derail. in some terminals derails are also used to prevent unauthorised entry into sidings. alternative device to protect vehicles rolling away onto the main line is catch point(s).
Insulator, английский
A specially designed component constructed of insulation material to separate parts of aqldqrelectri circuit from each other or from earth.
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