Watertown leader. [volume] (Watertown, Jefferson County, Wis.) 1909-1911, 1909-11-19

How about the single track?" The
automatic arrangement is the same, only
'here is signal at each end"
isn't it a possible thing for train
10 enter a single track at one end on
the same instant another enters at the
opposite end? What then?"
4es-but we have that taken care OF.
on double track a train through the
signal talks only to the train behind.
On the single track it not only talks
pack but also to one which may be COM
ing from the opposite direction This is
done by the current overlapping from
one block to the next. Before the en-
trance to single-track block is reached
the train sets stop signal at the far
END OF the block it is about to enter.
And as it enters the block it also sets
the entrance signal to stop, just as is
done on double-track
How does an engineer know before he
sees the home arm what it will signal?"
we put up another signal from half
mile to mile from the entrance to
olock-in the direction from which the
train approaches, 1t is called Distant
me one at the entrance is called the
Home signal. Lhe distant indicates the
position of home signal. see?"
is the distant distinguished from the
nome signal to aid the engineer"
Yes. the Distant is painted yellow,
with black bar, and has forked end
the Home red, with white bar ana
square end
You said Il while ago the stop signal
Anything but trains occur?'
Now you touch the most important
feature of the outfit, and the principal
reason why the arm is made so that
when left to itself it will stay firmly
at stop. AS it is constructed it cannot
show anything but stop, unless the entire
combination of rails wire, current mag
net, etc, are working perfectly. If
wire parts, rail breaks, battery falls,
a switch point opens the slightest then
the combination fails, the arm is released
and resumes horizontal position. The en-
glneer knows you see, when signal says
stop there may be a train, an open
switch, break in the track or in the
signaling apparatus"
What is done at night, when the
semaphore arm cannot be SEEM"
Lights of several colors are used on
these same posts. These are seen through
spectacles in the butt or weighted end
of the arm, and are displayed and OBJ
scured, according to the signal"
why the name spectace?'
That's what it is. The light is white
or ordinary flame color, supplied by an
eight-day lamp. 1t will burn eight days
without replenshing, although all lamps
the home signal is in stop position, the
engineer sees the flame through a red
glass. That's stop, and it is used only
in the home signals. If distant signal
is at caution he sees through yellow
glass. Yellow is used only in the distant
signal. 1t tells the engineer it is the
distant, and to be prepared to stop at
the home signal. He may see through
green glass. That means proceed, and
is used in both home and distant signal"
What does a white light mean?'
well, it is so easy to have we don't
dare use it. AS white light on a sema-
phore can be displayed by breaking spec
tacle glasses you can understand why
it is impossible in our scheme"
"How about places where two or more
lines cross at grader
1.-THE general principle, movements of
arm by day, and colors of light at night,
are the same but being greatly compli-
Gated all signals are controlled by levers
operated by men from a central station.
The crossing and contiguous tracks are
governed by the Interlocking system.
when in perfect order and unoccu-
pied it displays stop to every track ap-
preaching the crossing. The block. you
hpr CHI