Why is polarity important for DCC?

This is a fundamental electrical question regarding DCC. I have started educating myself and I know if I just follow prescribed wiring rules, everything will be fine. So, this is a question of understanding, rather than one of practical importance. There is a lot of vague information and unabashed misinformation about the electrical characteristics of DCC and it's a rare article that presents clear facts.

Here's what I think I know, so please correct me, if I'm wrong:

Hi,

I'm looking at a couple Loco's and would like to get a few opinions on them before I go ahead....  I'm looking at a Gensis GP38-2 (Milw) and a Proto2000 SD9 (GN), both DCC w/sound

These would be our first venture into DCC and I want to make sure I'm not making a mistake with these ones..

Also, a rookie question... When the specs say "separately applied", does that mean I will be applying them, or just that they are not part of the molded structure?

Thanks!

-Stephen

Hi Everyone;

I'm working on a new set of backdrops for our club modules. I'm looking for advice on the best adhesive for the 8x10 photos that I want to use on the Masonite I'm using as a backer.

Thanks

Louismca

I ran across this picture today and thought that it's a neat little detail in having yard speakers (photo right).  Obviously L&N used them and I believe that Tom Patterson has some on his layout.  I plan on putting one in my loco service area on my layout.