Profile of Hoosac Mountain made to accompany the Reports of the five Experts appointed to examine Hoosac Tunnel, showing the Number of lineal feet that each decides to be already lined, to be finished and safe, to require trimming to Arch and to require lining with Brick. November 1874. With an 8vo letter including a report by Geo. S. Morison (Appendix B, pages lxv-lxviii, lxix-lxxii). Fully extended map approx. 53 1/4 x 9 in. 

A detailed diagram showing the progress on the Hoosac Tunnel and the railroad system that would travel through the Hoosac Mountain. It combines the reports from five experts — geologists James Hall and T. Sterry Hunt, as well as civil engineers Josiah Brown, D.L. Harris and Thomas Doane — and translates them into a pictorial diagram marking what parts of the railroad are "already lined," "finished and safe," "to be trimmed to arch" and "to be lined with brick." 

The attached appendix is a letter by civil engineer George S. Morison containing a report detailing some of the proposed railroad routes the Hoosac Tunnel was going to include. While the report is incomplete, the subjects Morison covered were 1) "The several routes from the Hoosac Tunnel to Albany, Troy, or some other point where a connection can be made with existing railroad lines to the West," 2) "The railroad lines to the West, whether now in operation or projected, which the Tunnel railroad may look to making a connection with," and 3) "The lines of transportation by water from which the Tunnel railroad may derive traffic." 

The Hoosac Tunnel runs from its eastern portal in Florida, Berkshire County, Massachusetts, to the western portal in North Adams, Berkshire County, Massachusetts, a 4.75-mile stretch of active railroad. The tunnel was under construction from 1851 until 1875; when it was completed, it was the world's second-longest tunnel. To this day, it is still the longest active transportation tunnel east of the Rocky Mountains. It was also made an Historic Civil Engineering Landmark in 1975 by The American Society of Civil Engineers. 

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Some spots and tears to pages. A few pages missing in attached appendix.