Boston, MA: NYNH&H/New England & New England Roundhouse

(Satellite, once again, roundhouse land is now used for a parking lot.)

NYNH&H = New York, New Haven & Hartford

Tim Starr posted
South Boston waterfront view of the New York & New England full circle roundhouse, 1925. Gone by 1940. (Boston Public Library)

I studied the New York & New England RR to help find its route on the topo maps.

Wikipedia
"The earliest predecessor [of the New York and New England RR] was the Norfolk County Railroad, chartered April 24, 1847."

This map shows the Norfolk County Railroad.

LoC, published 1849

1893/93 Boston Quad @ 62,500

The lake was filled in and NYNH&H used that land for expansion.

1944/44 Boston South Quad @ 24,000