At the entrance of the Clearing-Office, in the corner, there is a small post-office of compartments for the letters and returns daily transmitted by the manager to each company. The office usually receives and despatches 4500 communications per day, employing five lads to open, endorse, and arrange them. The office is open daily from 9 A.M. till 5 P.M. * * * * * With a deep sigh we can truly say that we have now concluded a sketch of the Railway Clearing-House, which, as it gave us one headache to investigate, and another to endeavour to explain, will probably be equally afflicting to our readers. In justice, however, to the system, we must confess that it is impossible to convey in writing an adequate conception of the infinity of details with which it has to grapple. The number of items which in the course of a year, by the London office, are examined, traced through many returns, checked, and transferred from one account to another, exceeds rather than falls short of (50,000,000) fifty millions! It must be obvious to any person conversant with the working of railways, that, without a centralised system of this description, so constituted as to command the confidence of the railway companies, the railway system generally would not only soon become clogged, but constant squabbles and disagreements between the various companies would ensue, to the detriment of their interests, as well as to the discomfort and inconvenience of the public. The true object, therefore, of the London Railway Clearing-House is to enable the railway companies of the United Kingdom who are parties thereto, to work that enormous traffic, in which they have a common interest, with as much security to themselves, and with as little inconvenience to the public, as if all the associated companies were ONE; and it is evident that in no way could this important object have been effected, except by the establishment of an office which, based on principles of complete centralisation, should be--as the London Clearing-House really is--independent of each company, but under the common control of ALL. CHAPTER XV. MORAL. The few rough sketches which we have now concluded, insignificant and trivial as they may appear in detail, form altogether a mass of circumstantial evidence demonstrating the vast difficulty as well as magnitude of the arrangements necessary for the practical working of great railways; and yet we regret to add, in their general management there exist moral and political difficulties more perplexing than those which Science has overcome, or which order has arranged.--We allude to a variety of interests, falsely supposed to be conflicting, which it is our desire to conciliate, and from which we shall endeavour to derive an honest moral.