In the early forties of the 20th century, Western Union has used the first time a commercial intercity microwave transmission system. In the 30's of the twentieth century, Western Union has become the world's largest telegraph company. In 1860 the U.S. Congress arranged among the telegraph companies a competition to create a national line. The winner was Western Union. In order to increase competitiveness and market expansion of its services, Western Union launched a program of loyalty Western Union Gold Card for customers, who has repeatedly made money transfers via Western Union. July 3, 1884 the company's shares were included in the calculation base for the newly created stock index Dow Jones Transportation Average.