GONE TO THE RAILROAD.—The Messrs. Kimball—Heber P. and David P., started their train of 24 six mule team wagons yesterday at noon for the terminus of the Pacific railroad. They will load up about the 20th of June, and return here in August. They come back with merchandise for Ross & Barratt, Godbe, Cronyn and Co., and others. Several of the missionaries went out with them.