Definition: NSF Transit1 describes a type of transcontinental railroad that runs across two continents. It's an extension of the Transcontinental Railroad, running from Denver to Los Angeles through Kansas City in Missouri. This route crosses multiple countries but mostly traverses the western United States. The term NSF Transit1 is used in the context of transportation and infrastructure development within the U.S., specifically emphasizing its importance as a means of connecting the western United States with the rest of North America, primarily by rail.