Just started in N scale. (DCC Question)

[Santa Fe buff]

Hi all,
I would like to announce I've just started in N scale due to room limitations. I have started by buying the simple Bachmann train set, "Thunder Valley". It just includes an ATSF GP40, Penn Salt 3-dome tank car, Lehigh Valley 50ft boxcar, and a matching ATSF extended-copula caboose.

I'm surprised how small the E-Z Track circle is. I plan to upgrade to KATO Uni-track when I get the layout going.

My question is this... how can I install a DCC decoder into the ATSF GP40 to allow me to use a DCC system with it? If I can, I would like to have sound as well.

Cheers,
Joshua

[Santa Fe buff]

Good ideas. What type of Dremel bit would you recommend for milling the frame?

http://www.soundtraxx.com/dsd/tsunami/750.php
^ do you think that will work?

Cheers,
Joshua

[Santa Fe buff]

Alright. So, I'm going to have a look around for another Geep.

Cheers,
Joshua

[Santa Fe buff]

I just opened up my GP40 an did some measurements and concluded the TSU-750 is too large for my locomotive.

hmm, the hunt goes on. 

Cheers,
Joshua

[Santa Fe buff]

I double post if I want to. lol

I found this decoder:
http://tcsdcc.com/public_html/Customer_Content/Products/Decoders/HO-Scale/M-Series/M-Series.htm

It works out with dimensions and won't take much to squeeze it in. What do you guys think?

Cheers,
Joshua