The Aerorail system is fully automated and the vehicles can be linked together train-like for greater capacity. Because of its high speed, HSST can also serve to connect Greater Cincinnati with nearby cities. HSST has an operational system in Yokohama and has the financial backing of its parent company, Japan Airlines. It can span the Ohio river without any supports in the water. A one-quarter scale operating model already exists in Charleston, S.C. System 21 features sleek cars and a simple switching mechanism that makes limited networks possible.
Vehicles are available on demand, instead of running on fixed schedules.
Linear induction motors are used for both propulsion and braking. Because the vehicles are small the guideway is only 3.5 ft. PRT is being developed by the Advanced Transport Group. This system of small vehicles carries up to 4 passengers non-stop from their origin to destination and is available on demand. Plans are currently underway to build this system in Bristol.