Last Updated：2022/12/24
In the event of a failure, by the operation of a switch signalmen at the panel boxes can set up flashing white lights on certain signalling apparatus cases spaced at approximately half-mile intervals alongside the line, in order to call the lineman. The lineman can communicate with the signalman by plugging in a hand telephone at any one of these points.
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In
the
event
of
a
failure,
by
the
operation
of
a
switch
signalmen
at
the
panel
boxes
can
set
up
flashing
white
lights
on
certain
signalling
apparatus
cases
spaced
at
approximately
half-mile
intervals
alongside
the
line,
in
order
to
call
the
lineman.
The
lineman
can
communicate
with
the
signalman
by
plugging
in
a
hand
telephone
at
any
one
of
these
points.
