The Delaware Railroad from Dona to Nanticoke, in the direct line for Norfolk, is steadily progressing. The whole line has been put under contract at prices greatly be low the original estimates, the road being found, bysurvey and level, to be unequalled in right lines and low grades by any other, perhaps, ever laid out. The cost ofthe road will be 8306,000, two-thirds of which has been subscribed. This road willopen the en tire psninsula of Delaware andEastern Maryland and Virginia to Philadelphia.