The Hoosac Tunnel is a railroad tunnel connecting the Northern Berkshire towns of Florida and North Adams. Owned by Guilford Transportation, it runs under the Hoosac Mountain range for a total length of 25,031 feet or 4.74 miles. It took about 25 years to build. The Hoosac Tunnel would go on to be declared a Historic Civil Engineering Landmark by the American Society of Civil Engineers in 1975. It was the longest tunnel in North America until 1916 when it was beaten by Moffat Tunnel in the Rockies. It took 195 lives during construction, and has taken 30 or more since completion.
The Eastern Portal of the Hoosac Tunnel is the only one accessible for public viewing.