I'm still working on a layout plan and will include DCC (likely Digitrax). I plan to automate polarity (phase) switching for a reversing loop with a Digitrax or similar device, but not automate the turnout (handle separately w/o DCC control).
I've got a turnout within the loop that would go to a small yard outside the loop, by going thru a 90 degree crossing across part of the loop (from inside to outside). I'm wondering how the yard should be wired and whether the loop polarity reversal is interrelated because of how a 90 might be wired??? For example, is there any way a loop polarity reversal can create a short at the 90 crossing if I don't set up the wiring appropriately???
a) first, are the two through routes of a 90 crossing electrically independent (internally); i.e., connected to the opposite side but not each adjacent side? Perhaps a dumb question, but If so, that may prevent any issues.
b) given how a 90 crossing is internally wired, do I have to wire the yard taking off from within the loop a certain way or do I have choices? If the 90 crossing has 2 independent routes, I'd guess the yard entry and yard can be included in the loop subdistrict and undergo polarity changes (and not create a short at the crossing), or, I could isolate the yard entry and route into a subdistrict if electrically required.
As you can see, i've got myself confused...just want to ensure I don't design a hard to resolve problem. Thanks for any advice!!
Paul
Modeling HO with a transition era UP bent
WHo's crossing are you using? Atlas 90 degree crossings are insulated, but pass the power through - the frogs are plastic. So you can make a figure 8 layout and it will NOT be a return loop or anything requiring special wiring.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
I've also got an Atlas crossing, other than 90 degrees, and it too is insulated one route from another.
Elmer.
The above is my opinion, from an active and experienced Model Railroader in N scale and HO since 1961.
(Modeling Freelance, Eastern US, HO scale, in 1962, with NCE DCC for locomotive control and a stand alone LocoNet for block detection and signals.) http://waynes-trains.com/ at home, and N scale at the Club.
peahrensa) first, are the two through routes of a 90 crossing electrically independent (internally);
Yes, for the typical off-the-shelf pre-fab crossing.
It seems as if you might find this helpful:
Basic DCC Wiring for Your Model Railroad: A Beginner's Guide to Decoders, DCC Systems, and Layout Wiring
Layout Design GalleryLayout Design Special Interest Group