Question for old pros - classification yard

[sailor38]

I'm getting ready to add an "ell" extension to my 4X8 HO layout to serve as a classification/storage yard (stub end). It will be 33" W by 48"L. The first turnout off the mainline will be the runaround track. The second turnout will lead to the yard throat. I am thinking I will isolate some, or all, the yard tracks so i can park locomotives. I believe the geometry of the Atlas #4 turnouts will see to it that I can do any 0-5-0 switching that may be necessary (very little , I hope). I don't know if I can islolate right at the turnout or would I be better advised to isolate after the 1/3 radius that comes with them? Better yet, should I isolate farther down the track? Also, what is the simplest way to do the control - SPST, DPST, DPDT? Wiring suggestions welcome!

Finally, I am transitioning from code 100 to code 83. I read on this forum that someone used cardstock under the ties which seems like a really good idea. Question: How long should the "shim" be?

If there are any "gotchas" that I should be looking out for, please let me know.

Thanks in advance for your advice and opions and happy railroading to all!

Chuck

[dehusman]

If you want to just turn the tracks on and off, just put an insulated joint in one rail and use a SPST switch to turn the track off. The insulated joint can go anywhere. Normally you want it at the clearance point.

If you are using Atlas code 100 and 83 no shimming should be necessary. Atlas makes the ties on the code 83 thicker so the overall height of the track is the same. You just have to get transition rail joiners.

Dave H.

[dknelson]

Cardstock under ties can be a problem if you use water based glues to hold ballast
Styrene is available in similar thicknesses. Sometimes it is "free" in packaging etc
Dave Nelson

[sailor38]

To both Daves:
Thank you!
Chuck