The stentorian voice of the steam-horse, coming in with the train on the Norfolk & Petersburg Road, is just at this moment heard, as the cars dash over the splendid Iron bridge, about a mile distant. This road, by the way, is of special importance, not only to our city, but also to Richmond. Petersburg, and to the State, and the entire South.--The rapidity with which troops can be transported, the connection which it gives between the seaboard and the interior; thus securing an interchange of various articles of commerce, giving us needful supplies and sending hence articles wanted elsewhere — but who does not know the immense advantage of this important line of internal communication? We should award all due importance to that well managed and well known line, the Seaboard & Roanoke Road, extending hence into the old North State, and giving us a connection with various important chains of land travel and transportation Southward and Southwestward. To Col. Mahone, of the Norfolk & Petersburg Road, and Mr. Superintendent Robinson, of the Seaboard, and other officers connected with these lines of travel, the people are greatly indebted, at this war crisis especially, for the able manner in which they discharge their important and responsible duties. They who years ago urged the commencement and prosecution of these great public works, against powerful opposition, are entitled to the gratitude of the fortunate beneficiaries thereof, especially at this time, when our ports are blockaded and we are menaced by bloodthirsty and savage-like invading forces. When eloquent speakers, able statesmen, wealthy and influential merchants, and a whole army of old fogies and croakers, denounced the building of a road from Norfolk to Petersburg, urging the sufficiency of water communication, the probable failure of the enterprise, the unnecessary expenditure by the State and by individuals, it is well enough known by some that one of our citizens, noted as well for his enterprising spirit and clear perception of the present and future wants of the commercial public, as for his literary and versatile talent, not only originated, but urged the important work to a fair commencement, resulting in a vigorous prosecution and a successful result. Who doubts now the immense and paramount value of the Norfolk & Petersburg Railroad? "Honor to whom honor," &c.