2002年7月7日，北京铁路局大同车辆段担当的K708次空调旅客列车运行至京广线承安铺—寨西店，组中发电车97917突发火灾，造成车辆大破，构成客车大事故。事故原因经过初步分析，确定为发电车MTU柴油发电机组1号柴油机高压油管爆裂，油雾喷到高温涡轮增压器排烟管表面引起火灾。 July 7, 2002, Beijing Railway Bureau Datong depot as K708 air-conditioned passenger trains run to the Beijing-Guangzhou line Cheng’an shop - Walled store, the group fire 97917 sudden fire broke out, resulting in a large vehicle crash, a bus accident . After a preliminary analysis of the cause of the accident, it was determined that a high-pressure fuel pipe burst on the No. 1 diesel engine of the MTU diesel generating set of a power generating vehicle burst and the oil mist sprayed onto the surface of the high-temperature turbocharger exhaust pipe caused a fire.