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The sixteenth location on the map Road to Dawson. Available from level 50. Recommendation: to pass the location, carefully follow all points of the contract. Remember that as soon as you enter this location, the timer on the previous one, Gold Bottom, will start automatically, and after 24 hours it will disappear. Check if you removed everything from the Gold Bottom location.
Note: After completing the contract on Airport, you should be at stage 16/16 on the Railway Map board. There are no further railroad lands at this time.