
CT070-P01 · Photographs · 1977-04
Cos Cob Power Plant, Cos Cob, (Fairfield County, Connecticut)
Cos Cob Power Station
Aerial view of Cos Cob Power Plant, April 1977.
Read item & source notesCOLLECTION 070 · SGC-CT070-070
Fairfield County · Industrial sites
Engineering photographs preserve a lost power station central to railroad electrification.

Demolished railroad power plant; partly reused as parkland
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1977-04
Aerial view of Cos Cob Power Plant, April 1977.
1993
Two boiler feed-water reservoirs at Cos Cob Power Plant, viewed from the turbine hall roof, 1993.
1993
Remains of the original 1907 control panel at Cos Cob Power Plant, photographed in 1993.
1993
Turbogenerators inside the former Cos Cob power station. Units 1–3 in the foreground and frequency converters behind them show how electric power generation occupied the turbine hall.
COLLECTION HISTORY
The Cos Cob station was built in 1907 to supply electricity for the New Haven Railroad. Its coal-fired steam turbines supported the railroad’s alternating-current electrification. The plant belongs to the history of the whole transport system, alongside locomotives, overhead wires and substations. [CT070-S01] [CT070-S02]
ASME dates the end of plant operation to October 1986; broader accounts describe decommissioning in 1986–1987. The building was demolished in 2001 despite its historic recognition. Part of its former site became public parkland. Survey photographs preserve the building and machinery, and ASME identifies a commemorative plaque at Cos Cob Park. [CT070-S01] [CT070-S02]
Electric trains depended on a network extending beyond the tracks. Built in 1907, Cos Cob's coal-fired steam turbines supplied the New Haven Railroad's alternating-current system. The station belongs alongside locomotives, wires and substations in an account of electrification. Machinery photographs help make this otherwise hidden part of a passenger journey visible. [CT070-S01] [CT070-S02]
ASME's October 1986 operating-end date and broader 1986–1987 decommissioning accounts describe related but distinct events. Demolition in 2001 was a later physical ending, despite historic recognition. Parkland and a commemorative plaque subsequently preserved another kind of public connection with the site. Survey photographs now carry evidence of rooms and equipment no longer available to inspect in place. Comparing them with the later landscape raises a question about what documentation can preserve when a building itself is lost. [CT070-S01] [CT070-S02]
Fairfield County · 4 included photographs
Research edition: September 12, 2026
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CT070-P01 · Photographs · 1977-04
Cos Cob Power Station
Aerial view of Cos Cob Power Plant, April 1977.
Read item & source notes
CT070-P02 · Photographs · 1993
Cos Cob Power Station
Two boiler feed-water reservoirs at Cos Cob Power Plant, viewed from the turbine hall roof, 1993.
Read item & source notes
CT070-P03 · Photographs · 1993
Cos Cob Power Station
Remains of the original 1907 control panel at Cos Cob Power Plant, photographed in 1993.
Read item & source notes
ED-H2-HT-SP-023 · Photographs · 1993
Cos Cob Power Station
Turbogenerators inside the former Cos Cob power station. Units 1–3 in the foreground and frequency converters behind them show how electric power generation occupied the turbine hall.
Read item & source notesED-H2-HT-SP-024 · Photographs · 1993
Cos Cob Power Station
Turbine No. 2, installed in 1925, appears in the station's 1993 engineering survey.
Read item & source notesED-H2-HT-SP-025 · Photographs · 1993
Cos Cob Power Station
The condenser below turbine No. 3 records the equipment supporting steam turbine operation.
Read item & source notesED-H2-HT-SP-026 · Photographs · 1993
Cos Cob Power Station
The exciter supplied direct current to the field coils, connecting the control room to the generators.
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