Whether we contemplate the magnitude of the undertaking, or the vastness of the interests, which it is intended to accommodate, it is hardly possible to exaggerate its importance. Indeed, we may safely affirm that there is not a line in England which links together interests of greater importance in a _social_, _political_, and _commercial_ point of view, than the Chester and Holyhead Railway. To our vast American and West India trade this line will prove itself a most valuable adjunct; and on the completion of the Irish Midland Great Western line, which will unite the important harbours of Dublin and Galway in the West of Ireland, the mails and passengers from the United States, Canada, Nova Scotia, Newfoundland, New Brunswick, in fact, from every part of the western world, will be conveyed to the shores of England in about seven days, or three days earlier than by the present route, and by which means the most dangerous part of the voyage will be avoided. It is well known that the voyage along the north coasts of Ireland to Liverpool, has been attended with as many disasters as any in the annals of navigation. The harbour of Galway is not only ample in its dimensions, but easily accessible at all times; and the Midland Great Western line will traverse the very centre of Ireland, forming as it were a vast artery for the flowing of its produce into the markets of England. Our observations are peculiarly applicable to Ireland. What can tend more to a speedy and healthy development of the resources of that unhappy, but fertile island, than a means which facilitates the exportation of its agricultural produce to supply the increasing demands of our large manufacturing towns? We find that all the Irish lines converge into Dublin, the produce of the north and south of Ireland can thus be conveyed to that port, and shipped off to the port of Holyhead, and from thence by railway to the markets of England. The passenger and parcel traffic bids fair to become a very important feature in the development of this line. The week ending the 16th of June, the revenue derived from this description of traffic amounted to about £1,700, while on the succeeding week it had increased to £2,100; but it is right to observe that the great influx of visitors to witness the floating of the Menai Tubes, operated, to a great extent, in causing this increase, at the same time we may fairly anticipate that this is but a commencement of a succession of other numerous excursions, not only to view the romantic sceneries of Wales, but also to the picturesque lakes of Ireland. Arrangements are even now in progress to enable the public to visit the far-famed Lakes of Killarney, and the enchanting sceneries by which they are surrounded. And we may anticipate the happiest results from such a facility and cheapness of communication between the two nations.