Train communication gateways systems enable the exchange of information throughout the train. Gateways help to connect to the train communication network. They are also called protocol converters and may communicate using more than one protocol. There are two interface buses used in the TCN: Vehicle bus: Used for intra-vehicle communication, and Train bus: Used for wide information exchange. The wire train bus (WTB) gateway is used as a train bus, and a multifunction vehicle bus (MVB) gateway is used as a vehicle bus. Gateway bus technologies such as controller area network (CAN), serial links, and Ethernet train bus (ETB) are used as a vehicle bus. They provide larger bandwidths and a flexible network.