[4] The community is situated on Cos Cob Harbor, a sheltered area on the north side of Long Island Sound.

Cos Cob's role as a commercial shipping port, supplying potatoes and apples to New York City, disappeared with the appearance of the railroad and damming of the Mianus River.

[5][6] The Cos Cob train station and the Mianus River Railroad Bridge are listed on the National Register of Historic Places.

"On Christmas Day, 1848, the last rails were laid over the Cos Cob Bridge, thereby supplying the last link needed to complete the railroad from New Haven to New York," according to the Stamford Historical Society Web site.

William H. Holly, Esq., founder of the Stamford Sentinel and a guest on the first trial run, wrote: "The train had to remain at Cos Cob Bridge some three hours for the last rails to be laid over it and the delay gave ample opportunity to the people to come and witness the wonderful feat.

"[7] Edgar Hoyt, editor of the Stamford Advocate, wrote: "The citizens of the village as well as the horses, cattle, etc., were nearly frightened out of their propriety ... by such a horrible scream as was never heard to issue from any other than a metallic throat.

"[7] The coal-fired steam turbine Cos Cob Power Plant built by Westinghouse in 1907 was a Mission Style structure.