First, DCS operates best when the blocks are center rail-insulated from each other. Actually, that is what makes them blocks in the first place.
Second, each block should have one and only one connection to the TIU via a terminal block.
This is the exact opposite to Lionel TMCC/Legacy System. They don't recommend blocks. The command engines respond individually and no blocks are needed.
Now I have insulated the center rails in my yard and also in a passing track but that was so I could turn off the power in those sections using a Block Power Controller and a Switch and Accessory Controller. Otherwise there would have been no need to insulate those center rails.
