"In the southwest corner of Prussia," says Walter Littlefield, writing on this subject, "is a rectangular piece of territory, the western and eastern sides of which are formed respectively by the Belgian and Luxemburg frontiers and the River Rhine.... Five years ago, this little corner of Prussia had about 15.10 miles of railway to every hundred square miles of territory. At the opening of the war this had increased to 28.30. In five years, without any apparent industrial and commercial demand for it, this traction has been increased to nearly twice its length. Villages of less than 1,300 inhabitants have been linked up with double-track lines. For example, Pelm is 2-3/4 miles from Gerolstein, a town principally of comic-opera fame, and yet over this short distance, between the two villages, there are laid down six parallel lines of rail, besides numerous additional sidings.... Few of these lines, it is to be noted, cross the frontier. Three of them, as late as last May (this was written in the fall of 1914), led to blind terminals within a day's march of it--the double line from Cologne via Stolberg to Weiwertz, the double line from Cologne via Junkerath and Weiwertz to St. With and the double line from Remagen via Hillesheim and Pelm to Pronsfeld." "Another point that is noticeable," says another observer, quoted in the same article, "is that provision exists everywhere at these new junctions and extensions for avoiding an upline crossing a down line on the level, the upline is carried over the down line by a bridge, involving long embankments on both sides (so new that as yet nothing has had time to grow on them) at great expense, but enormously simplifying traffic problems, when it comes to a question of full troop trains pushing through at the rate of one every quarter of an hour, and the empty cars returning eastward at the same rate. "The detraining stations are of sufficient length to accommodate the longest troop train (ten cars) easily, and they generally have at least four sidings apart from the through up and down lines. Moreover, at almost every station there are two lines of sidings long enough for troop trains, so that they can be used to some extent as detraining stations, and so that a couple of troop trains can be held up at any time while traffic continues uninterrupted."