The next halt is at Crewe, where formerly a large exchange of bags took place, having been passed without stopping. Crewe is, for Travelling Post-office purposes, by far the most important junction in the kingdom. Within three hours--that is, between half-past eleven at night and half-past two in the morning--over a dozen mail-trains, each with sorting-carriages attached, arrive and depart; whilst the weight of mails exchanged here within the hours mentioned is not less than twenty tons. A great amount of labour is involved in receiving and delivering such an immense weight of bags, the work being all done by hand, and the mail-porters have to exercise great care in keeping them in proper course for the respective trains. Nevertheless, these responsible duties are remarkably well performed, mistakes very rarely occurring. The Irish mail which runs from London to Holyhead, and in which correspondence for Ireland is almost exclusively dealt with, branches off at Crewe, the remainder of the journey being run by way of Chester and North Wales. Leaving Warrington, the next stoppage is at Wigan. Here the mails for Liverpool are despatched, and the receipt includes bags which have been brought through a long line of country, stretching from Newcastle-on-Tyne through York, Normanton, and Stalybridge, and thence to Wigan. The mails for Preston and East Lancashire are left at Preston, and, running through Lancaster, Carnforth is soon reached. At this station the mails for North-west Lancashire and West Cumberland are despatched, and this is the last stopping-place before arriving at Carlisle, which is the terminal point of the North-Western Railway. Mention should be made of the noteworthy despatch of mails by apparatus at Oxenholme, the junction for Kendal, Windermere, and the Lake District. It is the largest despatch by that method in the kingdom, as many as nine pouches being delivered into two nets. Each pouch at this station weighs on an average fifty pounds, so that altogether four hundred and fifty pounds of mail-matter is despatched at this one station--no inconsiderable feat. At Carlisle the mails for the Waverley route country and for the whole of the south-west of Scotland, including Ayrshire, are left. There is another long run over the Caledonian Railway--about seventy-eight miles--without a stop, the apparatus being worked seven times in that distance until Carstairs is reached. Here, one of the sorting-carriages is detached, and proceeds to Edinburgh; and a few miles farther on three more are detached, and proceed to Glasgow from Holytown Junction. From that point, therefore, only two sorting-carriages remain in the train, and these go on to Aberdeen. The next stop is at Stirling, where the bags for the Western Highlands are left; and we then run on to Perth.