Old and new London : a narrative of its history, its people, and its places . s, where it joins the Brighton line. Throughout the whole length of the various 228 OLD AND NEW LONDON. [Underground London. systems of Underground Railways, it may besafely asserted that the works are signal instancesof modern engineering skill and ingenuity. Therails on the ]Ietropolitan Line were originally laidon the mixed-gauge principle, the rails themselveshaving steeled surfaces given to them ; but thesebeing found to be not of a very durable character,were gradually replaced with others of solid steel,which
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