The utility model discloses a car network system is put in order to rubber tyer trolley -bus train to the carriage intranet founds train network control system with the ethernet ring network who connects the carriage intranet, the carriage intranet includes bus network and/or ethernet, bus network and ethernet interconnection. Have and to reduce whole car network cloth line number volume by a widemargin, reduce the network and lay work load, reduce the network and lay the cost, effectively avoid the interference between the different equipment among the whole car network system, improve the stability of vehicle network control, can realize advantages such as internet access high -speed, high -efficient, the high stable.