How was the first metro system built? | Evolution of metro trains |Tech Baba

It is very common to see "Metro work in progress" boards across Mumbai, Kolkata, Hyderabad, Chennai, Delhi and Bangalore. Metro has provided a form of transport that has helped lakhs of individuals every day. But have you ever wondered, when was the first metro system built and how was it built? It began in 1863 in London with the concept of subways. A tunnel beneath the ground. It was a success with a 6 Km long route that costed around 700 to 800 million dollars. Watch this video to see how this system was put in place. #Techbaba #Metro