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In this study, ultra high‐speed is defined as a maximum operating speed of >250 miles per hour (mph) (402 km/h). Three technologies could potentially meet the operating speed requirement for UHSGT.
High-speed rail (HSR) is a major technology advancement, which is based on the same basic principles as the early railways, namely steel wheel on the trains running railroad tracks
The main feature of the maglev technology is that the trains levitate above the guideway using magnetic fields. There is no contact between the vehicle and the guideway.
There are two notable types of maglev technology:
Hyperloop is a proposed passenger and/or freight transportation using magnetic propulsion to carry vehicles through highly evacuated tubes with very high speed. The main goal of the concept is to reduce the air resistance and therefore to enable very high speeds combined with moderate energy consumption.
* Test track speed, which was limited by length of test track. Source: CH2M, 2017, Ultra‐High Speed Ground Transportation Study: Technology Options Technical Memorandum.