Explanation:

The Indian Railways plans to introduce Maglev trains that can run at a top speed of 500 km an hour.
? After receiving a proposal from a foreign investor, the Railways last week floated an expression of interest (EoI) for calling of a global tender to develop trains and tracks that operate on the principle of magnetic levitation (Maglev).
? According to this document, the developer will be responsible for designing, testing, building, running trials and operations of the levitation-based system between two key cities at a distance of 200-500 km.
? Maglev trains are in operation in China, Japan, Germany and South Korea. As the trains are propelled by magnetic forces, friction is eliminated, making transportation free of noise and vibration.