PURPOSE: To improve the check work and to avoid danger, by providing the communication unit to the drive car and other electric cars.

CONSTITUTION: The organization of cars is constituted with the drive car TC, electric cars M, M' and trailer car T, and they are sectioned with the purpose of check into e.g. four units. Further, the communication unit is provided to the drive car TC and each unit, and the master unit is provided with the signal display systems the same unmber as the units, failure display system, and timer circuit and the unit side is provided with the signal display system, failure dispaly lights and operation buttons. Further, the buttons to cancel the failure display to the master unit are provided, and when all the units perform signal display, the signal display for the corresponding unit can be kept for a given time with the timer circuit. As a result, the worker can make effective communication.