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  1. ...build road , house, office, etc. If it builds road , it could cure traffic congestion. It could be relate...too, if you build more office outside Central, less people need to travel to Central. I am not sure, coz...

  2. ...above. The vehicles traveling on the rails are ... or wagons) move with much less friction than on rubber tires on a paved road , and the locomotive that pulls the...