Hyperloop UPV
The Hyperloop UPV concept is a levitating rail-free pod design. Using magnetic repulsion and air cushioning for levitation is expensive and can produce unpredictable forces. The pod is equipped with a hybrid system of permanent magnets and electromagnet units, being able to control lift, so it can hover from the top of the tube. That way, the pod doesn't need so much electricity to be lifted by itself. Propulsion is obtained through expansion of the air with a nozzle, located at the rear of the pod, achieving speeds of up to 1000 km/h. The turbine recovers energy from the flow allowing a more efficient journey. This clean tube layout is said to cut costs in up to 30% of the whole Hyperloop project (about 180m USD) and the possibility to comfortably fit more passengers.
42nd Street Shuttle
In 1978 the U.S. Department of Transportation undertook a study to analyze and determine the feasibility of installing an Accelerating Walkway System in an urban environment. The study used the 42nd Street Shuttle as a case study. The two options the study analyzed were a one-directional reversible linear walkway and a bi-directional loop. The study found that the walkways would provide a better level of service during off-peak hours and a similar level of service during peak hours. It was estimated that it would cost between $5.4 and $13 million to install the system.