Vehicle defects related to accident causation are rare and likely to be due to deficient or defective maintenance.

车辆故障造成事故的情况很罕见。事故常常由维护不力或不当造成。

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Mechanical maintenance personnel had in maintenance to ensure machine should be in stop working state. And hang them, lest machine suddenly run for the accident happened.

机械维修人员在维修保养时应确保机器处于停止工作状态。并挂上警示牌，以免机器突然运行而发生人为事故。

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There should be strict operating procedures and technical measures to ensure the maintenance of safe, reliable and fast to avoid the accident occurred.

应有严格的技术措施和操作程序，以确保维修工作安全、可靠和快捷，避免意外事故发生。

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Her team will spend a week to 10 days looking at the bridge, talking to the truck driver whose vehicle hit it, and examining maintenance documents and previous accident reports.

NPR: NTSB Says Wash. Bridge Collapse Is Wake-Up Call

According to the NTSB, which is investigating the crash, maintenance records show that an "impedance bond" for the track circuit where the accident occurred was replaced June 17.

CNN: NTSB says train detection system failed in days before D.C. crash