The vehicle-carrying wagons are () long and have a metal frame that places a metal roof over the cab of the lorry, but the rest of the vehicle is not enclosed. Drivers load their own lorries onto the trains and, once they are in place and secured with wheel chocks, drivers are taken to the club car at the front of the train by bus. The club car offers free Wi-Fi, toilets and vending machines with drinks and snacks. At the end of the journey, drivers are taken back to their lorry by bus so they can drive off the train to continue their journey. Control centres Rail and road traffic control centres are operated 24/7. The overall management of the Channel Tunnel transport system is carried out from a railway control centre, the RCC. There are two control centres, one at each terminal, and each is capable of taking control of the system. The RCC manages all rail traffic (shuttles and trains) circulating on the Channel Tunnel infrastructure, including in the terminal areas. The system consists of two parts, RTM (Rail Traffic Management) manages all rail traffic in the tunnels and in the terminal areas, and the EMS (Engineering Management System), which manages fixed equipment such as ventilation, lighting, feeding electricity to the catenary wires. The Road Traffic Control Centres (TCC) are responsible for managing the movement of vehicles for Passenger and Freight services as they circulate around each terminal, presenting tolls, moving through border controls, boarding trains and exiting trains onto motorways (the A16 in France and M20 in the UK). Safety Safety regulations require two locomotives for all shuttle trains through the tunnel, one at the front and one at the back, and both must be staffed so that the train can be reversed out in case of a blockage. On shuttle trains, two Class 9 locomotives handle a single shuttle train. Each locomotive is capable of hauling the train on its own in the event that its partner fails. In the event that both locomotives fail, another train with two fully functioning locomotives has sufficient power to move both its own load and the disabled train through the tunnel. Diesel locomotives are also on hand at both terminals in case they are needed to help a train out. There are also attendants in shuttle trains that manage the vehicles, loading and interior functions. On freight vehicle