thank you all guys, it´s gotta be a short somewhere, and yes the layout is very complicated, two levels with over 300 feet, with only one standard terminal track, or one DCC rerailer if I run DCC only, the problem is I don´t know much about electrical connections and polarity, my big amount of turnouts is a mess with many loops.
If I read and understood you correctly I think I have this correct.
One, you need more than one feeder attached to the layout. One power feeder will not work. Feel the wires going to that one feeder track, are they getting warm? It could be that the resistance of the track alone over that distance is causing the overload, the power pack just can't push enough power through that one connection for the whole layout and this will show as an overload. One wiring "rule" is, (esp with DCC), never rely on one feeder to power the entire layout, unless it is a very small one.
Two, have you placed insulated gaps anywhere in the layout? In case you have some reversing loops that you haven't seen or don't know about, a direct short will show here without any gaps.
Three, can you post a copy of the plan you followed? It makes it a lot easier to diagnose a problem if we can see the plan for ourselves. The plan should show where the feeder(s) are located.
Four, If you have a hobby shop in the area, check and see if they have any books on wiring a layout. Kalmbach Publishing, (your friendly
MR publishers), have several, as does Cartsens, (the
RMC publishers). If no hobby shop, these can be found online.
While wiring a layout correctly is a lot of work, its not that hard.