The metro is a real boon for big cities. Underground tunnels, through which trains move at high speed, significantly relieve urban roads on the surface. One of the largest and most extensive subway lines is located in New York. Subway Idle 3D asks you to build something similar, starting with just one line and then expanding and adding new lines. You will triple the metro based on the money you have accumulated, and this depends on the number of trains, stops and ticket price. All these criteria and several others need to be gradually increased by increasing capital accumulation and expanding the subway in Subway Idle 3D.
