Kavach

<p> <iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/jibYjWE09oA" title="YouTube video player" width="560"></iframe></p> <p> 'Kavach', which literally means armour, is the world's cheapest automatic train collision protection …