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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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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Applicable to the freight yard handling, maintenance, repair and other accident inspections of indoor and outdoor mobile lighting.

适用于货场装卸、巡查检修、事故抢修等各种室内外场所作移动照明。

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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