On December 25, 1848, the last section of track on the railroad from New Haven to New York was completed over the Cos Cob Bridge.

Beginning in 1907, the NYNH&H built the Cos Cob power plant as part of an effort to electrify the main line.

The station has two high-level side platforms, each six cars long, serving the outer tracks of the four-track Northeast Corridor.

It has a clapboarded exterior, and an asymmetrical gabled roof with a short face toward the track, caused by the loss of the original platform shelter.

The Cos Cob Power Station, a former New Haven Railroad electrical substation on the western edge of that bridge, is also NRHP-registered despite being demolished during the turn of the millennium.