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Calling all railway buffs - What's a Run Through?

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Calling all railway buffs - What's a Run Through?

Old 12th May 2021, 21:15
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Calling all railway buffs - What's a Run Through?

Just had a meeting at work where some guy waffled on about this new piece of kit we were piloting. Apparently Run Throughs are bad because they cause derailments in the yard and this kit helped identify when they happened (I presume BEFORE the said derailment)

He was pretty pleased with the video, but of course failed to actually define what a "Run Through" was, or why it caused problems

I *think* it's maybe going through points (or as we call them here, a switch) backwards against the way they're set - something like that

Anyone here know?
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Old 12th May 2021, 21:41
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This paper seems to provide a full clear explanation - with pictures….

https://rosap.ntl.bts.gov/view/dot/42500/dot_42500_DS1.pdf

Last edited by ORAC; 13th May 2021 at 09:09.
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Old 13th May 2021, 05:57
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In English terminology this is known as trailing the points.
Modern railways allow for this in the design of the switches and point machine, although this would normally be provided on the Main Line and Loop Lines.
In the case of a Yard the installation of trailable points is optional, protection against trailing is provided by de-railing devices or Trap Points which deflect uncontrolled train movements from running through the points and or fouling the main running lines.
The trailable point machine is a complex mechanical device that will allow the points to be split at speeds upto 25kph after which they can easily be reset.
Trailing a non-trailable point machine will cause major damage and expense and is thus avoided by de-railers and Traps.
It is a standard item in new installations to test at least one machine to prove the mechanical operation and subsequent effect on the signalling system.
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Old 13th May 2021, 08:36
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Originally Posted by ORAC View Post
This paper seems to provide a full clear explanation - with pictures….

https://rosap.ntl.bts.gov/view/dot/4..._42500_DS1.pdf
Link works better without trailing "?" !
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Old 13th May 2021, 15:27
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'Run through points' as found in many sidings, whereby the force of the train moves them across if set in the other direction when coming from a set of sidings.
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Old 16th May 2021, 13:49
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Thanks for the info. I passed it on at work
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