from the Detroit Publishing Company Collection, Library of
Congress |
This photo of "Columbia College from the Southwest" shows the
center mall of Broadway opened up for subway construction, and along
the edges of the hole appear the conduit tracks of the Broadway
streetcar line. The subway had to underpin the conduit track, which
was kept in service throughout the digging underneath.
As completed, two subway tracks, the downtown local and center
tracks, are under the mall, and the uptown local is under the street;
and of course the station platforms extend under the street. The
Columbia University station was originally reached from a house built
in the mall on the north side of 116th Street, which was removed in
1969 when the sidewalk stairs were opened. Just north of the station
the subway structure of steel bent and concrete jack arch changes to
an early experimental use of reinforced concrete arch, which happens
to include the area under the 117th Street streetcar crossover
track.
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