The contractor shall retighten the nuts one week after joint installation and a second time just before final lining and leveling of the track.
承包商应于接头安装后一周重新拧紧螺母，并就在轨道最终衬砌和整平前再一次拧紧。
There are three components to this system: a large electrical power source, metal coils lining a guide way or track, and large guidance magnets attached to the underside of the train.
这种系统有三个组成部份：一个大电源、一条导向线路或轨道沿线的金属线圈、以及附加在列车下面的大导向电磁铁。
Insulated joints if required shall be installed just before final leveling and lining of the track.
需要时，绝缘接头应在轨道最终衬砌和整平前安装。
Insulated joints if required shall be installed just before final leveling and lining of the track.
需要时，绝缘接头应在轨道最终衬砌和整平前安装。
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