Travel to southern Colorado and northern New Mexico and BNSF’s Raton & Glorieta Subdivisions, home to Amtrak trains #3&4, the Southwest Chief. This is a comprehensive look at the former AT&SF line between La Junta, Colorado and Albuquerque, New Mexico and the passenger trains that run over it. It’s the last place in the U.S. to see semaphore signals running outside of a museum.