A train stop or automatic stop of the Kinsman system is used at all
block signals, and at many interlocking signals. This is a device for
automatically applying the air brakes to the train if it should pass a
signal in the stop position. This is an additional safeguard only to
be brought into action when the danger indication has for any reason
been disregarded, and insures the maintenance of the minimum distance
between trains as provided by the overlaps established.
Great care has been given to the design, construction, and
installation of the signal apparatus, so as to insure reliability of
operation under the most adverse conditions, and to provide for
accessibility to all the parts for convenience in maintenance. The
system for furnishing power to operate and control the signals
consists of the following:
Two 500-volt alternating current feed mains run the entire length of
the signal system. These mains are fed by seven direct-current
motor-driven generators operated in multiple located in the various
sub-power stations. Any four of these machines are sufficient to
supply the necessary current for operating the system. Across these
alternating mains are connected the primary coils of track
transformers located at each signal, the secondaries of which supply
current of about 10 volts to the rails of the track sections. Across
the rails at the opposite end of the section is connected the track
relay, the moving element of which operates a contact.
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