The New Haven owned the mainline and the spur at the time. The spur was known as the 'Groton Branch' The main industries served were Sunoco Ready Mix Cement, near where the spur left the main, Groton Airport, Esso Oil, Pfizer, and Electric Boat Company. The track is still there, and can be followed on Google maps:
https://www.google.com/maps/place/Groton,+CT/@41.3412721,-72.0417338,16.58z/data=!4m6!3m5!1s0x89e6093f23ffd9e5:0x44ff1732c5e11cc5!8m2!3d41.3481528!4d-72.078663!16zL20vMDNsaGoz?entry=ttu&g_ep=EgoyMDI2MDMxMS4wIKXMDSoASAFQAw%3D%3D
It splits off the main right at South Rd, runs west past Tilcon Connecticut (Was Sunoco), then turns sound towards Beer'd Brewing and down to the airport. The siding with the station and freight house there is long gone. It then heads west again, passing through a golf course and on to Pfizer, Something oil, and Electric boat. Except for the branch tracks headed to Electric Boat, the old Pfizer tracks are gone. There is still a fair amount of track left at Electric Boat.
Len
https://www.google.com/maps/place/Groton,+CT/@41.3412721,-72.0417338,16.58z/data=!4m6!3m5!1s0x89e6093f23ffd9e5:0x44ff1732c5e11cc5!8m2!3d41.3481528!4d-72.078663!16zL20vMDNsaGoz?entry=ttu&g_ep=EgoyMDI2MDMxMS4wIKXMDSoASAFQAw%3D%3D
It splits off the main right at South Rd, runs west past Tilcon Connecticut (Was Sunoco), then turns sound towards Beer'd Brewing and down to the airport. The siding with the station and freight house there is long gone. It then heads west again, passing through a golf course and on to Pfizer, Something oil, and Electric boat. Except for the branch tracks headed to Electric Boat, the old Pfizer tracks are gone. There is still a fair amount of track left at Electric Boat.
Len
