Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1911-12-12

proceed" ordrs are T0csGvol az :
hasman has beso sent ahead - ~
vestigato. s.
These signals operate . ven g
night az by day. At night when tho
position, it displays . red Msht Whsd'
the arm u in IN inclined positioo. n,
dicating . clear block. . gTeen nsh6s
Is displayed II the nghts should fnill
to work. there 10 warning stgnal ~
the absence Of either the rcd or Krooa,
lights. Tho mute orders are to stop.
just AZ though red light W. Aashea'
down the track.
Thus the engineer runs hi train
with confidence In the electric sauhp.,
matte block system. He Knows ~.
man IN the signal tower IN gtyfng hin,
the right Of way automat3cally 0oe0.
signals against Ill other trains lfo0
entering tie block which 10 ocenpass.;'
Work Of che Totsossaon.
After studying the signals q the
semaphore arm. which prsvsat eoilis
sions and Academia, the man = IT,
tower who operates the signals comes
next In front Of the man n the
switching tower 10 Q map covered WITH
little lines corresponding 70 tho co.,.
fusing network Of tracks which mako
up the railway yards and main trucks.
On this map each track II numhee10
and each switch - destgnated b
symbol.
BY means Of the map - IL swiecD
tower. the great problem q reoslytn9
and dispatching trains u solved. The
tower man has planned The IaplH
movement of al trains without WASTE
Of time or disastrous accidents long
before their arrival at signals Of -
lions. In this way hundreds q trains
travel owe. the right tracks with sDoe0'
and safety. because al witches and
block signals are under the control a..
the man in the tower, whose map tellD'
him when and where al trains are 70
&c.
Mistakes and collisions are almost
because when the mao IN
the signal tower has set cor1ain,
switches he cannot open Other
witches without changing his Arst
Efgnals automatically. It IL the same.
way with every clock signal along the,
Jne; once signal - given Il cannot
be changed without setting Instantly
other signals against It.
On single tracks trains enter The
blocks from both directions, ana & -
necessary to provide signals j ~ bpth..
ends Of every block. In, making The
block signals overlap each other, two
trains approaching the same block
from opposite directions at the same
time are prevented from getting
clear" signals to enter tho block q.
On many roads Of double tracks the
are provided With two !.
arms for controlling two blocks n.
stead of one This system Of overlap ],
ping the various block sections Gives |
advanced signals 70 appfoaehin0 !
trains. Tho extra arm tails Tie 90
gineer whether the second block -
nal beyond is at Q stop" or . 1pso-
coed" position. and II the first block
IS clear, and the second obsTucteds
the train can thus proceed with can
ton to the next signal.
At railroad crossings. ends q double
track. and all places whore traokn
cross or converge. the switches ar
operated by "inteelocking signals" By
means Of levers the switches and stg,
nails are SO interlocked that e . 1nAH'
possible to give 'clear" signals ovef
the same track for two Different
trains. The Interfering signals dt&of
from the block signals IN that Two o.
more semaphore arms are used Cegss
tain arms arc used for certain tT11n1s
Emergency Tests for gMveSo0e9. y
Quite few Of the leading railway,
systems, which have laros mdlGaool
Of automatic signals. hsvs adupesl ],
plan Of carrying out ssHpsAsoe q
dcdency" tests for trainmeo. These
are sometimes called "ensreaaGy'.
tests. and the object u - mako suro
that the trainmsn 80 oosyeng opseate
ing rules and respecting. III aG1s ]
warnings.
on q western railroad t. sanoGylf
10 betnG advaoeo6 t1reaoArl
out the entire system b. eaxnpelUI
known % the safety hahlf haeln1
plan" The slogan that - ps1nea6 - {
each button 10 'oet the sazsGy f. i.
t." ,sss
These novelty buttons havo 49,.
freely distributed among IL agly -
railroad workers with s1eollsnt ~
suits.
Another large railfuaa UDtan -
started 1t the founda130n q tntnot.
10 promote the safety nnuv1gleo
among employees. 81