The Hoosac Tunnel and Troy and Greenfield Rail Road (Classic Reprint)

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Excerpt from The Hoosac Tunnel and Troy and Greenfield Rail RoadAs before stated, the gallery at the west end, some 550 feet long, was excavated through a body of loose limestone, be yond this point, the material changes to earth and Mohamed, abounding in water, and in which very little progress has been made. The present indications are that this formation will continue, with little interruption, to the base of the moun tain - say, feet, or about half a mile. There can be no doubt that a tunnel through these materials will require heavy side walls, with substantial arching overhead and, through much of the distance, an inverted arch at the bottom.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.