A communication system for supporting communication between an end node of a vehicle and a remote correspondent node via a fixed network, the communication system comprising: a plurality of wireless access points of the fixed network, each wireless access point having a directional antenna arrangement for mm wave radio communication using directional beams; and characterised by comprising: a plurality of wireless modems (111, 113, 701, 703) arranged to establish mm wave radio communication links to wireless access points of the plurality of wireless access points, the mm wave radio communication links supporting a data session between the end node and the remote correspondent node, the plurality of wireless modems (111, 113, 701, 703) being located on the vehicle and employing electronically steerable beamforming directional antennas for establishing the mm wave radio communication links; wherein a first wireless modem of the plurality of wireless modems (111, 113, 701, 703) is arranged to establish a first mm wave radio communication link to a first access point of the plurality of access points using a first main beam being directed in a forward direction for the vehicle; a second wireless modem of the plurality of wireless modems (111, 113, 701, 703) is arranged to establish a second mm wave radio communication link to a second access point of the plurality of access points using a second main beam being directed in a rearward direction for the vehicle; and the communication system further comprises: a link manager arranged to terminate the second mm wave radio communication link in response to a link failure for the first mm wave radio communication link, and to initialize setup of a third mm wave radio communication link between the second wireless modem and a candidate access point in response to the termination of the second mm wave radio communication link. a plurality of wireless modems (111, 113, 701, 703) arranged to establish mm wave radio communication links to wireless access points of the plurality of wireless access points, the mm wave radio communication links supporting a data session between the end node and the remote correspondent node, the plurality of wireless modems (111, 113, 701, 703) being located on the vehicle and employing electronically steerable beamforming directional antennas for establishing the mm wave radio communication links; wherein a first wireless modem of the plurality of wireless modems (111, 113, 701, 703) is arranged to establish a first mm wave radio communication link to a first access point of the plurality of access points using a first main beam being directed in a forward direction for the vehicle; a second wireless modem of the plurality of wireless modems (111, 113, 701, 703) is arranged to establish a second mm wave radio communication link to a second access point of the plurality of access points using a second main beam being directed in a rearward direction for the vehicle; and the communication system further comprises: a link manager arranged to terminate the second mm wave radio communication link in response to a link failure for the first mm wave radio communication link, and to initialize setup of a third mm wave radio communication link between the second wireless modem and a candidate access point in response to the termination of the second mm wave radio communication link.