•ion ol Uic city.The Pacific Railroad U Tap Maw Mexico.The following letter, taken from the Santa Fe iVriff Mexican, will explain itself: Wyandotte, Oct. 31,1863.Dear Sir:—In answer to jour communication through Mr. Houghton, I beg leave to state that the main line of the Union Pacific Railway. K. D, commences on the south bank of the Kansas river, so as to connect with the Pacific Railroad of Missouri, runs up the Kansas river t£ Fort Riley. It is the purpose of the company and tho expressed desire of the Government that the continuation of our line