Mumbai–Ahmedabad high-speed rail corridor

The Mumbai–Ahmedabad High Speed Rail Corridor (Mumbai–Ahmedabad HSR) is an under-construction high-speed rail line, which will connect Mumbai, Maharashtra, the financial hub of India, with Ahmedabad, the largest city in the state of Gujarat. When completed, it will be India's first high-speed rail line, with a design speed of 350 km/h (215 mph), and the project will include a 353 km-long (219 mi) viaduct, which will be the longest bridge in the world.

Source: Wikipedia — Mumbai–Ahmedabad high-speed rail corridor (CC BY-SA 4.0)