Trains pass through building in China

Local trains pass through a residential apartment at Chongqing city in China. Engineers took two two years to design the railway station in the apartment and another two years to construct it. The station has the sound proof system which will not disturb residents the apartment whenever a train passes through the apartment. Sound emanated by a train is equivalent to the sound of the dishwasher. The city with a population of 4.9 crore has no place to lay railway line connecting colonies in the city.