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What is a "D" rail?
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Dogoth
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What is a "D" rail?
 
« on: Jul 21st, 2016, 8:19pm »
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Most of my railfaning has been in the western US so maybe it's a U.P. contrivance but I occasionally see a 3rd rail at a siding with a purple sign (white text) that simply says "D". I've also heard this referred to on my scanner by crews and yard admin but don't know what it stands for or what it's special use is.
 
Thanks in advance for your reply.


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Marty_Feldner
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Re: What is a "D" rail?
 
« Reply #1 on: Jul 21st, 2016, 9:28pm »
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It's not a "D" rail, it's a derail- a device (there are several types) that will deliberately derail a piece of equipment (generally) on a side track, if it should start to roll by itself, before it could foul the main line. Google 'derail sign', images, for several examples.

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Dogoth
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Re: What is a "D" rail?
 
« Reply #2 on: Aug 7th, 2016, 3:59am »
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Thanks. I'm familiar with the derailer device. Nope this is a piece of track (siding) that is usually a 3rd short siding where they sometimes park construction equipment cars etc...
 
It is denoted with a purple square sign that has white text "D" in the center. I hear them speak of it frequently on the road channel. Just curious why it has a special designation. I can think of at least 4 "D" rails with a 100 mile radius.


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