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I've gone through thousands of them and still haven't found a good source. Not everyone sells the 1 oz pack (80 pins), and the ones that do charge more than the cost of the pins to ship them. All they need to do is stick them in a padded envelope and put a buck postage on it.

 

I've tried direct from Gargraves, no problem, but no bargain. I tried Train World when I ordered a case of track... out of stock. I've gotten them off Amazon, I forget the actual vendor.

 

My advice, order more than you think you'll ever need, so you don't have to do it ever again.

A quick look finds the coefficient of linear expansion of steel to be 6.7 X 10(-6) in/in-deg. F  Correction noted, I read the wrong column, thank you KD.

 

Your 20 ft length of track.

 

 20ft X 12inches/ft X (6.7 X 10 (-6)) X (lets say a 100 deg temp. change)=1,608 X 10 (-4) in   .1608 inches.   from a really bad winter day to a really hot summer day. 

Last edited by Mike CT
Originally Posted by Adriatic:

After doing lots of long straight lightweight industrial instillations, I have to wonder what the thermal expansion rate of GG track is. On 20ft+, Are gaps like that on dead cold track going to bind once warmed by current?

Do you screw down your straights, and let the curves float? 

Good grief! 

 

What kind of temperature extremes will your layout encounter???

 

Depending on which genre you have, the rails are either tinplated CRS (steel), or stainless steel (not sure whether austenitic or ferritic).

 

Anyhow....

 

Steel:  6.7 (x0.000001 in/in-F)

Stainless Steel: 5.5-9.6 (x0.000001 in/in-F) depending on composition

 

Ergo, for worst case, in a 3' section of flex track, with a temperature variation of, oh say, 20 degrees F (pretty extreme for a basement, I'd say) you could expect that piece of track to expand about 0.006912 inches.  That's for austenitic stainless (pots&pans grade...no rust/oxidation).  For CRS, the 3' piece would travel about 0.004".

 

Frankly, I'd be more concerned about the national debt, if I were you....and no one seems to care about that.  No one.  Nada.  Zip & Zed.

 

Sleep well, my friend.

 

KD

 

 

Last edited by dkdkrd

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