Watch the game while your trips are in progress to have a chance of receiving gifts, which include Bux and coins. Tap the "Free Bux" button in the shop. You can earn 2 Bux for each advertising video that you watch. During levels 3 and 4,there are lots of opportunities to make trips to earn Bux. Play often to keep the trains moving. Most of the stations are close one to another, requiring about five minutes to reach their destinations. . As long as your trains are moving, they are earning money. Do not spend Bux to refuel. Every minute of waiting costs 1 Bux. It is better to let the fuel tanks refill without paying. They do not have to be full to make the new trip; you only need the minimum amount. Play the daily event which usually requires you to deliver a specific number of crates to the destination marked by a golden exclamation mark on your map. When completed, you can earn free Bux and train cars.