I have a CSX 6214 HO EMD GP40 Diesel Loco and would like to know which DCC Decoder and speaker to use that would fit in this casing.
Suggestion: Don't add sound because it is a lot of trouble because there really is not sufficient space without milling.
Click Here (http://www.soundtraxx.com/choose/step3.php?t=ho&s=Bachmann)
scroll down to GP40
http://www.soundtraxx.com/manuals/tsuinstallation.pdf
I did one in a GP30 using a 1/2" speaker on the rear of the frame where it stepped down. Joe
(http://i1288.photobucket.com/albums/b493/bapguy/IMGP0151_zpsdd16dd7c.jpg?1426709492480&1426709493067)