The question is, would you rather have a dummy in tow behind powered unit to house the speaker and like a soundbug or other sound only decoder? I have something similar with the gp40 set that came out with the dummy engine. Has anyone seen these sets recently?
I am not familiar with a GP40 set with a dummy.
Can you post a picture or a link?
It was something Bachmann did for Great Planes distributing a few years back. They came in a long box with a powered, dummy, and caboose as a set for about $20 more than the engines solf for by themselves.
If I am not mistaken LIFE- LIKE did this as well with a GP38-2 and their F40PH's.
mots