New Passbeoeb Coaches.—We have hereto fore noticed tbe arrival of four new passenger coaches from Philadelphia, for the Richmond and Danville railroad. They have been placed on the line, and are represented as be ing unsurpassed for elegance, comfort and general finish. Some new box para have also been lately placed upon the road. Nearly all of the strap or fiat raH baa boon removed, and substituted by heavy iron, nnd the trains are now making much better time than formerly