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Should the telegraph have been put on hold because of its negative impact on the Pony Express ? Secretary ) shall undertake a study of the land and water route used to carry mail from Sacramento to San Francisco , California , to determine the feasibility and suitability of designation of such route as a component of the Pony Express National Historic Trail designated by section 1 of this Act [ amending this section ] . Upon completion of the study , if the Secretary determines such route is a feasible and suitable addition to the Pony Express National Historic Trail , the Secretary shall designate the route as a component of the Pony Express National Historic Trail .