Current events: Train goes through apartment building in China

China has some of the fastest growing cities in the world. Their population is sky rocketing. Since their population is growing they have had trouble picking where to lay their train tracks. There is some really high buildings around so that can make it an issue too. Engineers came up with an idea to put a railway line  through a block of apartments.  You'd think that it would be really noisy but engineers came up with an idea to make the noise less powering.  It is supposed only make the noise of a dishwasher. A bonus for those living in the building can actually catch the train from your building. 

Source: Kiwi Kids News 

3 words 
1 Engineers: a person who designs and builds machines and structure 
2 Train : A series of connected railway carriages or wagons moved by locomotive. 
3: Population: Is the number of the people in the country. 

My opinion: I think this is really cool and quite smart because it's using space extremely well. 

I wonder: How long does it take to build the railways in the apartments.