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Weather extremes
 Moderated by: Herb Kephart
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 Posted: Sun Jan 7th, 2018 11:46 pm
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2foot6
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I have seen the news on TV this morning and it mentioned the extreme weather we are having around the world.Sydney Australia had a high temperature of 47.5c,that's 117. f and yet on the other side of the world -38.f is being experienced.What an amazing difference.I can't help thinking about what the difference in temperature makes to trackage on my layout.I have track move side ways and even lift upwards.That was even after expansion gaps were cut into the track.So how does the extreme cold effect trackage from your normal summer temperature to the cold winter months? I'm asking just as a matter of interest,as I had to take into account the expansion problem when building the layout,(rail expansion and timber frame contraction)but is it an issue in other parts of the world in relation to extreme cold. ...............Peter.    :old dude:



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 Posted: Sun Jan 7th, 2018 11:55 pm
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W C Greene
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Howdy Peter, are you using flex track or hand laid? I believe it does make a difference. I have seen flex laid in a tangent look like a drunk snake when temps change. My old outdoor layout with handlaid track would occasionally have a kink but nothing that was unfixable. My new layout in an insulated garage has no problem...so far. Maybe some others will tell how their track fares in temp. extremes.

Woodie



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 Posted: Mon Jan 8th, 2018 12:18 am
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Larry G
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Here in the Black Hills of South Dakota/Wyomong, USA, we have large swings in temp. Three days ago our temp was -5 f. Yesterday, it was 50+. I did not have any problems with expansion of rail, scenery or timber framework. This may be because my basement train room is insulated, heated and air conditioned. My Gn15 layout is built almost entirely on insulation foam. My HO urban layout is built almost entirely on the usual wood frame with plywood top board.

Insulating your layout space may help to keep the temps more uniform.

Larry Gant

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 Posted: Mon Jan 8th, 2018 12:24 am
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2foot6
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I'm using Peco flexitrack with 12 yards of hand laid track.Both have been affected by the heat.My shed is drywalled with silver foil insulation (moisture barrier).Our temperature extremes ....0c-42c  or  32f-110f as a reference........Peter



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 Posted: Mon Jan 8th, 2018 12:55 am
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Michael M
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My outdoor layout (35n2) has survived without any major problems so far.  I've been using flexible track and it seems to be okay.  I do paint my track and hit it with a UV protective spray, and it's buried in ballast (sand & dirt), so maybe that helps.  I use mortar instead of plaster for the scenery, and everything is glued down with Titebond III.

Some of the boards on my borax tipple come loose, but some super glue fixes that real quick.  Some signs on some of the buildings have faded, so those are slowly getting replaced.

I'm getting more selective in the materials and glues that I use knowing that the structures have to deal with Mother Nature.

Here in Southern California the temperatures are not too extreme so that helps.



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 Posted: Mon Jan 8th, 2018 04:10 am
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Kitbash0n30
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If you are in the mood for math,

"Solution to Problem 263 Thermal Stress Problem 263 Steel railroad reels 10 m long are laid with a clearance of 3 mm at a temperature of 15°C. At what temperature will the rails just touch? What stress would be induced in the rails at that temperature if there were no initial clearance? Assume α = 11.7 µm/(m·°C) and E = 200 GPa."https://www.mathalino.com/reviewer/mechanics-and-strength-of-materials/solution-to-problem-263-thermal-stress

Or if not, and you just  want to buy something and be done with it,
March 2013
Rail News: MOW Railroad suppliers provide ways to prevent track from bending and twisting
Since the neutral temperature can't be set when rail is laid, "we must set the desired neutral temperature, which is determined by each railroad based on their criteria," says Zuspan, adding that the American Railway Engineering and Maintenance-of-Way Association (AREMA) provides a formula to compute a desired neutral temperature. For example, well-built and maintained ballasted track might not buckle until it registers an increase above the neutral temperature of 50 F to 70 F, and the same track might not pull apart until it experiences a decrease below neutral temperature of 105 F to 130 F, emphasizing the need to correctly set the desired neutral temperature, says Zuspan. De-stressing rail minimizes the risk of a buckle, he says. There are several ways to de-stress rail, including the use of a rail puller and special rail heaters, which direct a flame into the web of an unrestrained piece of rail to heat it and elongate it by a specific amount, depending on the current rail and neutral temperatures, he says.


http://www.progressiverailroading.com/mow/article/Railroad-suppliers-provide-ways-to-prevent-track-from-bending-and-twisting--35444

Last edited on Mon Jan 8th, 2018 04:21 am by Kitbash0n30



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 Posted: Mon Jan 8th, 2018 04:33 am
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Michael M
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Kitbash,

That just seems like way too much work. 

I do cut some gaps in my rail just to be on the safe side.  So far, so good.



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 Posted: Tue Jan 9th, 2018 12:36 am
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2foot6
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It looks like I have met the math standards of kitbashOn30 formulae.We had a temperature of 42c day and high humidity and had no problems with the track. :glad:It has been three years since problems occured but I was worried after the other day.Looking around the layout most gaps have closed considerably,hopefully the rails return to their normal position in the cooler months...................Peter  

Last edited on Wed Jan 10th, 2018 10:47 pm by 2foot6



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 Posted: Wed Jan 10th, 2018 12:23 pm
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Kitbash0n30
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Yay! Success is good. All I did was report what I knew of. I know of far, far, more than I know.

Last edited on Wed Jan 10th, 2018 12:24 pm by Kitbash0n30



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