[1][2] At the end of his college studies, Norwich awarded Linsley a certificate of proficiency in civil engineering.

[1] From 1852 to 1855, Linsley was an engineer and construction contractor on the Kankakee division of the Illinois Central Railroad.

[1] Linsley's work traced the origin and history of the Morgan Horse breed from Justin Morgan's ownership of the foundation sire Figure in the late 1700s to the late 1850s[1] and continues to be regarded as the seminal work on the history of the breed.

[4] From 1856 to 1859, Linsley was publisher of the Vermont Stock Journal, a monthly magazine that provided information on breeding and raising farm animals.

[1] Contemporary news accounts of the tunnel's construction indicate that the stress associated with the work caused Linsley's hair to turn white prematurely.

[1] During the American Civil War, Linsley supported the Union and took part in activities including recruiting drives at which he contributed to cash bonuses paid to newly enlisted soldiers.

[9] In addition, he operated a contracting business, D. C. Linsley & Company, which undertook projects including providing gas lighting for the town of Windsor, Vermont.

[1] The business was later operated by new partners as S. S. Churchill & Co.[1] Linsley was the Democratic nominee for lieutenant governor in 1865 and was defeated by Republican Abraham B.

[17] In 1874, Linsley was one of the organizers and promoters of the Burlington and Lamoille Valley Railroad, and he was its president from 1874 to 1875 and chief engineer from 1875 to 1876.

[1] Linsley was the company's chief engineer and conducted the initial surveys to determine a route.

[1] The work was still in progress at the time of Linsley's death, but the enterprise proved unsuccessful, and the company became defunct.