| 摘要 |
PROBLEM TO BE SOLVED: To always directly monitor the close contact of a regular rail and a tongue rail and a disorder of the rail such as intervals between these rails and the like. SOLUTION: Conductive rubber 11, 11' of which resistance is changed in accordance with the quantity of deformation is arranged between the regular rail 1A, 1B, and a tongue rail 2A, 2B through struts 12, 13, 12', 13'. The resistance of the conductive rubber 11, 11' when the tongue rail 2A, 2B is stuck with the regular rail 1A, 1B is monitored. If the resistance is within the scope of upper and lower limits threshold prescribed previously, it is determined to be a normal contact state.
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