Monday afternoon, when we return to Baltimore so as to allow us to make a start for the West on Tuesday. We are to travel quite _en prince_, over the Ohio and Baltimore railroad, one of the most wonderful of all American railways. At New York we had introductions given us to request the officials of this line to allow us to travel on the engine, or on the cowcatcher if we preferred it! either of which would undoubtedly have given us a fair opportunity of viewing the scenery; but papa saw to-day, at Baltimore, the managing director, who has arranged for the principal engineer to go with us, and he is to take us in the director's car, which we are to have to ourselves, and this gentleman, Mr. Tyson, is to let us stop whenever we have a fancy to do so. We are to go fast or slow as we may prefer. We are to start on Tuesday morning, at the tail of the express train, and we have only to give the signal when our car will be detached. There are only two or three trains daily for passengers; but there are goods' and extra trains for various purposes, which are constantly running at different speeds on the road. It is by reattaching ourselves to any of these, that we can, when we like, effect all this, and have an opportunity of seeing, in the most leisurely manner, and without any detriment to the other passengers, the various parts of the road that may be worth exploring. The line is very beautiful, and I hope Mr. Tyson will be prepared for my frequently stopping him when I see trees, with their splendid red leaves that I may wish particularly to gather. We are to take our food in this carriage, if necessary, and have beds made up in it, so as to make us quite independent of inns, and we may pass as many days as we like upon the road. We are to do this because, though some of the hotels are good, we may not find them at the exact places where we wish to stop. Papa has no connection with this road, and it must be American appreciation of his virtues which has led the officials to deal with us in this luxurious way. On Tuesday the 19th inst., therefore, we make our real start for the West, and shall probably the first night reach Harper's Ferry, a place which President Jefferson, in his "Notes on Virginia," which you will find in papa's library, said, was "one of the most stupendous scenes in nature, and well worth a voyage across the Atlantic to witness;" and this was written when these voyages were not so easily accomplished as they are now. But this railway has opened up scenery which was not known to Jefferson, and is said far to surpass, in beauty, even this celebrated Harper's Ferry; but of this we shall soon be able to judge for ourselves.