TRAIN INFORMATION MANAGEMENT DEVICE

摘要

A second-system terminal device 21-2 installed in one vehicle is connected to a first-system backbone transmission line 1 and a second-system backbone transmission line 2, and when having received a status information packet B from a second-system terminal device 31-2 installed in another vehicle from the first-system backbone transmission line 1 or the second-system backbone transmission line 2, the second-system terminal device 21-2 installed in the one vehicle transfers a control packet A to the second-system terminal device 31-2 adjacent to a side farther from a central device than the second-system terminal device 21-2 that has received the status information packet B, by using the backbone transmission line from which the status information packet B has been received.