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How Do  signals work????????????????????????????????????????
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   How Do  signals work????????????????????????????????????????
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   Author  Topic: How Do  signals work????????????????????????????????????????  (Read 544 times)
Trainmasterman
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How Do  signals work????????????????????????????????????????
 
« on: Sep 20th, 2008, 10:06am »
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How do Signals work

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Dre
J. M. Fusco
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Re: How Do  signals work????????????????????????????????????????
 
« Reply #1 on: Sep 21st, 2008, 10:14pm »
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Usually with light bulbs.

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Christian_S.
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Re: How Do  signals work????????????????????????????????????????
 
« Reply #2 on: Sep 22nd, 2008, 9:08am »
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http://en.wikipedia.org/wiki/North_American_railroad_signals

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conrail_fan_2005
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Re: How Do  signals work????????????????????????????????????????
 
« Reply #3 on: Sep 25th, 2008, 9:46pm »
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train signals are activated once a train locomotives triggers a special circuit that is either in a signal control box.
 
Or you can just click the link in the post above me.
 
 
And yeah they also work with bulbs...........unless they make LED's in them  


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Charlie Ricker
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Re: How Do  signals work????????????????????????????????????????
 
« Reply #4 on: Oct 8th, 2008, 6:43pm »
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No offense intended, but what's with with all the question marks when one would have been enough?

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~Charlie Ricker

limejuice
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Re: How Do  signals work????????????????????????????????????????
 
« Reply #5 on: Oct 28th, 2008, 5:24pm »
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Electricity!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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firstbelt
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Re: How Do  signals work?
 
« Reply #6 on: Nov 4th, 2009, 1:08pm »
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on Sep 20th, 2008, 10:06am, Trainmasterman wrote:       (Click here for original message)
How do Signals work

 
It's all in how you phrase the question.  Maybe you're wondering about signalling systems, versus the signal appliance.
 
Systems on conventional railroads operate on low voltage circuits in isolated track sections, similar to (pre-DCC) wiring of a model railroad with block controls.  Locomotive or rolling stock axles complete a circuit.  When a train enters the block, the signal equipment either lights a signal or changes control circuits.
Each railroad in the U.S. was free to develop its own system of signal aspects.  Chicago & North Western put its signals on the fireman's side.
http://www.rrpicturearchives.net/showPicture.aspx?id=1523272
 
In most cases, you see red/yellow/green aspects, like highway intersection traffic signals.  Passing a red signal is prohibited for a train, so track car operators engineers must request permission to do so, like when backing onto a train after working at a yard.  A dispatcher usually controls traffic on main lines, or at least has the final word.
In this photo, the red signals for the siding and the power switch to the mainline are controlled by the dispatcher.  The mainline signals are for the interlocking, operated by control circuits.
http://www.rrpicturearchives.net/showPicture.aspx?id=1671802
 
Messing with railroad signals is breaking one or more U.S. federal laws, so kindly leave them alone.


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