about long and is made from constructive stainless steel. The carriages used for the shuttle have a larger loading gauge than either British or French railways. As a result, they cannot travel outside the tunnel and the two terminals onto the national railways. Passenger vehicle shuttle trains Car shuttle trains for passenger vehicles have a locomotive at each end, with a series of fully enclosed vehicle carrying wagons in between, each wagon long. The wagons on the front half are single deck and rear half are double deck. Each shuttle train also has a “single deck loader” at each end of the single deck section, and a “double deck loader” at each end of the double deck section. These loading wagons have doors that open for loading vehicles and close for travel through the tunnel and plates that allow vehicles to travel between the train carriage and the platform. Double deck loader wagons also have a ramp that allows vehicles to access the upper level. Ordinary cars and vehicles below in height are typically loaded onto the double deck portion of the shuttle. Higher or longer vehicles, such as motorhomes, vehicles pulling a trailer and coaches, are loaded onto the single deck portion of the shuttle. Ordinary cars can also be placed in the unused portion of single deck wagons. Eurotunnel will occasionally run the double-deck carriages at "half full," closing the top deck to reduce staffing costs. When loading, vehicles drive between carriages, but the carriages are closed off individually when the train moves. Once boarded, drivers and passengers can exit their vehicles to walk around or use the toilets, but there are currently no onboard services. Toilets are provided in every third carriage in the double-deck section and in the loading carriages in the single-deck section. Passengers are advised not to walk between the vehicles in areas that are not designated crossing areas, because the gradients in the tunnel ( of continuous slope at 1.1% on the English side) mean there is a dangerous possibility that vehicles could roll back and/or forward if the drivers forget to turn on the parking brake. Freight vehicle shuttle trains Lorries (trucks) are carried on trains separate from passenger vehicles. These shuttle trains have a locomotive on each end, two sections of 16 mostly open vehicle-carrying wagons (train cars) and a single passenger carriage called the "club car" which is () long.