Before a nationwide network of numbered highways was adopted by the states, what were named auto trails were marked by private organizations. The route that would become US 66 was covered by three highways. The Lone Star Route passed through St. Louis on its way from Chicago to Cameron, Louisiana, though US 66 would take a shorter route through Bloomington rather than Peoria. The transcontinental National Old Trails Road led via St. Louis to Los Angeles, but was not followed until New Mexico; instead, US 66 used one of the main routes of the Ozark Trails system, which ended at the National Old Trails Road just south of Las Vegas, New Mexico. Again, a shorter route was taken, here following the Postal Highway between Oklahoma City and Amarillo. Finally, the National Old Trails Road became the rest of the route to Los Angeles.