Anna Avenue, 1 24
Freeman Street, 1 12
176th Street, 2 66
---- ----
Total, 37 393
The total number of signals, both block and interlocking, is as follows:
Home signals, 354
Dwarf signals, 150
Distant signals, 187
----
Total, 691
Total number of switches, 224
It will be noted that in the case of the City Hall Station three
separate plants are required, all of considerable size, and intended
for constant use for a multiplicity of movements. It is, perhaps,
unnecessary to state that all the mechanism of these important
interlocking plants is of the most substantial character and provided
with all the necessary safety appliances and means for rapidly setting
up the various combinations. The interlocking machines are housed in
steel concrete "towers," so that the operators may be properly
protected and isolated in the performance of their duties.
CHAPTER X
SUBWAY DRAINAGE
The employment of water-proofing to the exterior surfaces of the
masonry shell of the tunnel, which is applied to the masonry, almost
without a break along the entire subway construction, has made it
unnecessary to provide an extensive system of drains, or sump pits, of
any magnitude, for the collection and removal of water from the
interior of the tunnel.
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