- Luke
Modeling the Southern Pacific in the 1960's-1980's
New Haven I-5,
I assume you are talking about HO scale.
I have several of the Soundtraxx LC decoders in HO and diesel locomotives. A good rule of thumb is to use the largest speaker you can get into the space available. In my steamers, some of which are Bachmann 4-8-4s, I installed a 1.1 inch dia. speaker and enclosure from Tony's. Using a properly sized enclosure is important.
There is usually plenty of room in an HO tender for a speaker and a decoder. Diesels are another matter.
Good luck,
Remember its your railroad
Allan
Track to the BRVRR Website: http://www.brvrr.com/