The New York and New Haven Railroad was merged into the New York, New Haven and Hartford Railroad in 1872, and the station became part of that railroad. Beginning in 1907, the NYNH&H built the Cos Cob power plant as part of an effort to electrify the main line. As with all New Haven Line stations along the Northeast Corridor, the station became a Penn Central station upon acquisition by Penn Central Railroad in 1969, and eventually became part of the MTA's Metro-North Railroad in 1983. The station was added to the National Register of Historic Places in 1989.
Station layout
The station has two high-level side platforms, each six cars long, serving the outer tracks of the four-track Northeast Corridor.[4]: 19 The station has 567 parking spaces, of which 361 are owned by the state.[5]
Built in about 1894, the station house is a modest wood-frame structure measuring about 50 by 20 feet (15.2 m × 6.1 m). 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 interior retains most of its original finishes. It was listed on the National Register of Historic Places in 1989 as Cos Cob Railroad Station.[6] The nearby Mianus River Railroad Bridge is also listed on the National Register. 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.
