Transportation ways, speed and quality have direct effect on a business and financial development of a city. Passenger transport is also an important thing for a city to grow with man power. There are many means of city passenger transport, the main one is Metro Train. It's both faster and safer than many other means. In our case there has been a problem in the signal of a metro train, so the train can't move from the station where it's stopped now. You find a way to fix that signal else passenger can't goto their respective work areas at correct time. Good luck. Trouvez le moyen de réparer le signal en utilisant les aides.