Under-rail jumper wires on Gargraves track?

No problem at all electrically.

I did individual drops below the table and then wired them together.  That allows me to add insulated rail capability in the future if I decided I wanted it by simply disconnecting the second rail from the lever nut and thus insulating that rail.  If the soldering is directly under the track, it would be more difficult to do that.

Nothing wrong with it, it’s whatever you think is the easiest to execute.

on my clubs most recent layout I simply alternated witch rail got the feeder to the bus and in areas where I was concerned like between two switches I ran both outside rails to the bus or made a jumper. (I remember putting in a jumper and I think it was an area I missed at at the time that was easier 😉)

While @gunrunnerjohn didn't write this, he may have done this as I had done in places around my layout. As I installed the gargraves track and thought it would be a place for a future isolated rail, I used insulator pins to isolate one of the outer rails, then after track was installed, did as John wrote to jumper the isolated rail to grounded rail under the table to allow for easy isolation in the future.

Thanks all!

@MED posted:

While @gunrunnerjohn didn't write this, he may have done this as I had done in places around my layout. As I installed the gargraves track and thought it would be a place for a future isolated rail, I used insulator pins to isolate one of the outer rails, then after track was installed, did as John wrote to jumper the isolated rail to grounded rail under the table to allow for easy isolation in the future.

I didn't install any insulators, I have a Dremel tool.   If I decide to have insulated rail signals, I'll just add a gap were needed.  I am thinking I'll use my ultrasonic sensors for the job anyway.