Diagnosis information acquisition device, car, train diagnosis system and train

The invention provides a diagnosis information acquisition device for a train car. The train car comprises a car-mounted device; the diagnosis information acquisition device at least comprises n diagnosis information acquisition units for acquiring the diagnosis information of the car-mounted device; the car-mounted device builds communication connection with the n diagnosis information acquisition units, and n is an integer more than 2; and the diagnosis information acquisition device can improve communication redundancy and realizes diagnosis data transmission with a large amount of data. Besides, the invention also provides a car adopting the diagnosis information acquisition device, a train diagnosis system formed by multiple diagnosis information acquisition devices and a train with the train diagnosis system. 本发明提供了种用于列车车厢的诊断信息采集装置，其中车厢包括车载装置，诊断信息采集装置至少包括n个用于采集车载装置的诊断信息的诊断信息采集单元，车载装置与n个诊断信息采集单元分别建立通信连接，其中n为2以上的整数。诊断信息采集装置能够提高通信冗余性、实现大数据量的诊断数据传送。此外，本发明还提供了采用该诊断信息采集装置的车厢、由多个该诊断信息采集装置组成的列车诊断系统和具有这样的列车诊断系统的