B&M Hoosac Tunnel at North Adams, MAThe B&M's 4 and 3/4 mile Hoosac tunnel where professor Mowbray first experimented with tri-nitro glycerin. Over 100 men died in it's construction.
1800's postcard.
Unknown photographer June 6, 1890.
Added to the photo archive by Stephen G. Myers, October 24, 2003.
Railroad: Boston & Maine.
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