I did an older one for my son. It was a split frame design and identical in construction to the Dash 8 that I did and was used by TCS on their web site http://www.tcsdcc.com/public_html/Customer_Content/Installation_Pictures/HO_Scale/Bachmann/Spectrum_Dash_8-40CW/Spectrum%20Dash%208-40CW.html if yours is the split frame as well then everything you need to know is in this link.
Simon Modelling CB&Q and Wabash See my slowly evolving layout on my picturetrail site http://www.picturetrail.com/simontrains and our videos at http://www.youtube.com/user/MrCrispybake?feature=mhum
When you figure it out, use a TCS decoder and take pictures and send it to TCS. This is one they don't have. If they use your pictures you get a free decoder.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
Scale? Is it DCC ready? New Spectrum or older Spectrum?
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
Could you please help me? which decoder and how difficult is this install