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Shorts are shorts. The same things that cause shorts in DC cause shorts in DCC. I am assuming things were ok before? How did you make the transition?
Go to http://www.xtrkcad.org It's free, and will do a nice job of letting you draw your plan. Do the tutorials, then start drawing. Then do the tutorials again, they'll make a lot more sense the second time.
I think I misunderstood the problem! It sounds like you are asking for a professional job, without paying for it! If money is the issue, it's going to be a lot cheaper to buy the software than to get someone to do what you are asking. Have a look at this: http://www.trainplayer.com/index.html If I am remembering right, it has various ways of importing your design, and then you can add the scenic elements.
Left and right are as though you were in the cab. It doesn't matter as far as the wiring from the decoder to the pickups, it's ambidextrous anyway. The only thing that matters is the the brushes on the motor, and if you get that wrong you can flip them. In theory, hooking the orange wire from the decoder to the brush that used to be connected to the right rail should make "forward" "forward".
The glue will hold! Another reason to remove the screws is that you won't drive any other screws into them later.
Do you have a reverse loop?
I was thinking that a power nailer would be great for the job. I think with spring clamps and a nailer you could glue up a girder in no time!
And the very original, there's probably only one in the world, and I have it, Prodigy!
You've got to have a resistor in series. Something like 680 Ohms probably, maybe a little larger. As far as a recitfier goes, it's not a bad idea, since it will protect the LEDs from reverse voltage, and will allow them to be lit all the time, rather than half the time.
AC can be bad for the LEDs. At DCC voltages probably not, though you will most likely be beyond the guaranteed spec. To avoid any question you can put a diode parallel to the LED, conducting the opposite way, or use a rectifier so it doesn't see reverse voltage.
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