Help identifying QSI pre-PS1 Boards

Dd289OGR Forum Member

This is a bit of a follow up to: https://ogrforum.ogaugerr.com/...c/170922644673689785 but may also be of help separately. I ended up looking to replace just the sound for a 1996 Railking GG1 that does not have the Protosounds board, just the horn sound.

I have an old used ERR Railsounds board that I am going to use to upgrade the sound only (I am using this set as conventional).

So far I removed the speaker to replace with the new speaker. I can always just wire in the new board and be done but was thinking what existing boards can be removed? Could someone offer any advices as to which if any are able to go...I see the top one is connected to the speaker and guess one is a reversing unit, maybe #3? Originally thought there would be 2 total boards, sound and reversing, but the 3 has me confused?

Thanks in advance!!!

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