Years have passed since your successful foray across the great American West, stopping at tiny Whistle Stops while building a massice railroad empire. But railroads were only the beginning. Now you're taking your company's massive profits and investing them in new technologies, deep in the Rocky Mountains where there is an abundance of water, coal, iron, gold... and whistles! Your workers diligently build scaffolds and machines, collect resources, and upgrade abilities. The evolving gameboard creates ever-changing options as this worker-placement strategy game progresses. With the help fo your airship fleet, hurry to escape the melting snow and save your workers from rising waters!