Panama Canal Railway
The Panama Railway also operated a significant shipping line, connecting its service with New York and San Francisco. It ran a Central American line of steamships linking Nicaragua, Costa Rica, San Salvador, and Guatemala to Panama City. The shipping service was greatly expanded when canal construction began. Ships included the SS "Salvador", SS "Guatemala", SS "Cristobel", and , which became the first of the ships to cross the completed canal in 1914.
In 1904 the United States took over the license to build and operate the canal. The choice to use locks and an artificial lake (Gatun) meant that the old railway route from 1855 had to be changed because it followed the Chagres River valley, which would be flooded by the lake. Also, the railway would be extended and altered continuously for the building process. The stock of the Panama Railway Company, vital in canal construction, was entirely controlled by the United States Secretary of War.
History of Panama (1977–present)
Despite his continuing concern with the ambiguity of the treaties with respect to the United States role in defense of the canal after 2000, the close Senate vote made Torrijos aware that he could not secure any further modification at that time. On June 16, 1978, he and Carter signed the instruments of ratification of each treaty in a ceremony in Panama City. Nevertheless, Torrijos added the following statement to both Panamanian instruments: "The Republic of Panama will reject, in unity and with decisiveness and firmness, any attempt by any country to intervene in its internal or external affairs." The instruments of ratification became effective on June 1, 1979, and the treaties entered into force on October 1, 1979.