I found this connector, It's a board that has a DB-9 (M&F) and three wires (BK,RD,WH) coming out of the center.
What was this used for and how is it connected?
The rest of the story is; I inherited a three rail layout with TMCC (incl. Cab-1, (2) TPC's, BPC, and a sw./acc. controller)
My goal is to try to install Legacy CAB-2 and Base. Hoping to use both Cab-1 & 2