The compass was invented in China during the ninth century to be able to sail in the open sea. During the second half of the fifteenth century it was given a different use. The miners started using it to do underground work. It is considered the most used element in navigation from the fifteenth century.
Seen by the map, almost every railroad crosses into Fort Worth in Texas. It was also a major hub for cattle drives, which is why the railroads went there also.
