On May 1, 1971, the private railroads ceased passenger service and it was taken over by Amtrak, the government-owned National Railroad Passenger Corporation. Dozens of trains that ran on April 30th ceased to exist. Hundreds of cities lost their trains. What remained is largely the bare-bones operation, outside of the Northeast Corridor, that still exists today. This even though the nation has added 100 million people, become much more densely populated, and oil prices will make the car- and airline-based future seen as inevitable in 1971 increasingly difficult to sustain.
Amtrak was created because of a massive grassroots campaign. It was also an effort to help save the bankrupt Penn-Central and the freight railroads in general. But it was also born in sin as a deeply flawed political compromise, dependent on a federal subsidy that few lawmakers would or will admit is necessary, and a political plaything depending on who controls Congress and the White House. Something had to be done. Whether Amtrak was the answer is open to debate. America once enjoyed the best and fastest passenger rail system in the world. It was killed by automobiles and airlines that were heavily subsidized by the federal government (and continue to be), even as the private railroads were taxed and regulated heavily. Nor were the externalities priced in: Pollution, energy consumption and the resulting geopolitical instability, sprawl and its environmental consequences, etc. After spending heavily on new streamliners after World War II, railroads saw passenger business steadily fall off to this subsidized competition. Some fought on with top-notch service, notable the Santa Fe. Others couldn't wait to kill their trains, notoriously the Southern Pacific.
Both served Phoenix in the 1960s. The Santa Fe ran a classy little train from Union Station to Williams Junction, where it connected with the road's premier transcontinental streamliners, including the Super Chief, El Capitan, Chief, San Francisco Chief and Grand Canyon Limited. The SP operated three trains in each direction until the mid-1960s: the crack Sunset Limited, the Golden State and the remnant of the once grand Imperial. By 1970, only the Sunset survived, a raggedy thing that usually had a couple of coaches and a vending-machine car (a decade before, the Sunset routinely had 14 cars, including sleepers and full-service diner). Cities such as Cincinnati and St. Louis had dozens of trains, right up to the eve of Amtrak. After Amtrak, cities usually had one train, often at inconvenient hours (Phoenix had service until the mid-1990s, when the state government refused to help upgrade the northern main line of the SP).