Sid Meier's Railroads! is a business simulation game developed by Firaxis Games on the Gamebryo game engine that was released in October 2006 and is the sequel to Railroad Tycoon 3. Although Sid Meier created the original Railroad Tycoon, subsequent versions were developed by PopTop Software. Railroads! was the first game in the series since the original to have direct input from Sid Meier himself. After a visit to Miniatur Wunderland in Hamburg, Germany, Meier was inspired to reinvent his original creation. A version for the Mac OS X was published by Feral Interactive on November 1, 2012, under the latter's Feral Legends label.