reach speeds of up to 300 km/h at significantly lower infrastructure costs than stand-alone maglev lines. Similar to proposed Vactrain systems, magrail is designed to allow a later-stage upgrade with a vacuum cover which will enable vehicles to reach speeds of up to 600 km/h due to reduced air pressure, making the system similar to a hyperloop, but without the necessity for dedicated infrastructure corridors. Energy use Energy for maglev trains is used to accelerate the train. Energy may be regained when the train slows down via regenerative braking. It also levitates and stabilises the train's movement. Most of the energy is needed to overcome air drag. Some energy is used for air conditioning, heating, lighting and other miscellany. At low speeds the percentage of power used for levitation can be significant, consuming up to 15% more power than a subway or light rail service. For short distances the energy used for acceleration might be considerable. The force used to overcome air drag increases with the square of the velocity and hence dominates at high speed. The energy needed per unit distance increases by the square of the velocity and the time decreases linearly. However power increases by the cube of the velocity. For example, 2.37 times as much power is needed to travel at than , while drag increases by 1.77 times the original force. Aircraft take advantage of lower air pressure and lower temperatures by cruising at altitude to reduce energy consumption but unlike trains need to carry fuel on board. This has led to the suggestion of conveying maglev vehicles through partially evacuated tubes. High-speed maglev comparison with conventional high speed trains Maglev transport is non-contact and electric powered. It relies less or not at all on the wheels, bearings and axles common to wheeled rail systems. Speed: Maglev allows higher top speeds than conventional rail. While experimental wheel-based high-speed trains have demonstrated similar speeds, conventional trains will suffer from friction between wheels and track and thus elevating the maintenance cost if operating at such speed, unlike levitated maglev trains. Maintenance: Maglev trains currently in operation have demonstrated the need for minimal guideway maintenance. Vehicle maintenance is also minimal (based on hours of operation, rather than on speed or distance traveled). Traditional rail is subject to mechanical wear and tear that increases rapidly with speed, also increasing maintenance. For example: the wearing down of brakes and overhead