have a high speed rail system, making the high speed trains is really the tip of an iceberg. What really makes systems a success or failure is the railway that they run at. Railways like roads have speed restrictions, and like on roads, often the speed restrictions are below the top speed of the train. Building a fast train is easy, but its building tracks good enough to allow trains to safely and smoothly travel at 160-200 mph or 250-320 km/h, which are also long enough to allow the trains to accelerate up to these speeds (often many miles) and decelerate, is quite difficult The primary problem with existing railways is that they can have tight curves. The centrifugal forces on an object going round a bend are the function of the square of velocity, i.e., double the speed, quadruple the centrifugal forces, triple the speed, centrifugal forces increase by nine-fold. Therefore even what might appear mild curves provide problems at speed.