No attempts were made to extend the Santa Fe during the long period of depression following the panic of 1873. The road ended in 1872 at the Colorado state line, and during the next few years the only building of importance was a western spur to connect with the Denver and Rio Grande at Pueblo, thereby giving an outlet to the growing city of Denver and the rapidly developing mining regions of Colorado. About 1880, construction was resumed in a leisurely way, down the valley of the Rio Grande into New Mexico and in the direction of Albuquerque. In this extension, as in later building, the line of the old Arizona trail was usually followed. One writer has declared that "the original builders of the Atchison followed the line of the Arizona trail so religiously that if the trail skirted a ten-foot stream for a quarter of a mile to strike a shallow spot for fording, the railroad builders did likewise, instead of bridging the stream where they struck it, and where the trail ran up a tree or hid in a hollow rock to avoid the wolves or savages, the railroad did the same!" The traveler of a generation ago over this particular section of the Santa Fe lines might have felt that there was some truth in this criticism; but the Atchison has long since cut out these idiosyncrasies of early construction, and the main line in this section of New Mexico is now noted for alinement and absence of curves and grades. The builders of the Santa Fe lines in the early days no doubt planned ultimately to penetrate to the Pacific coast, knowing that the real opportunity for the road lay in that direction. The Southwest was yet but sparsely settled; and no railroad which had as its objective the plains or alkali deserts of Arizona or New Mexico could thrive--at least it could not for decades to come. And yet in the early eighties the real objective of the Atchison system had not been determined. Having passed its original objective point, Santa Fe, the road had reached Albuquerque, but it could not afford to stop there. Through traffic it must have or die. New Mexico, with its thin population and its total lack of development, could not supply traffic in sufficient amount even to "feed the engines." To extend somewhere, then, was an imperative necessity. But whither? Several routes were under consideration. The Southern Pacific lines had worked eastward to El Paso on the Mexican border, several hundred miles due south from Albuquerque, and it looked feasible to extend the Atchison to that point and arrange a traffic agreement with the Southern Pacific, or to build an extension through New Mexico to Deming and then westward along the river valleys and down into Mexico to Guaymas on the Gulf of California. It was possible, in the third place, to build directly west from Albuquerque through Arizona and Southern California to the coast. Ultimately all of these plans were carried out.