Uncoupler locations & hidden/undertable uncouplers

Basically, you'd want to locate them where you'd want t drop cars -- i.e., on industry spurs positioned close to the turnout leading into the spur. You'd also need one positioned on the adjacent mainline track so you could cut the car(s) loose from the rest of the train. If you're careful, you can push an uncoupled car further into the spur without the car re-coupling.

So, that both after the switch, not in front of the switch?  Front being the single end of the switch and after being on the two diverging ends?  I figured that would be the locations, but due to the problem I had of locomotives stalling out on them being so close to the switch I'm leery of it.  But I was using O36 switches before, and will use O72 on my layout.

Correct. One on each of the diverging ends, but you can place them further back if you're concerned about the engine stalling...

Good question.  Would you also wire both the uncouplers together so only one button is needed?  Is it common to do this? 

Matt-

Thank you for the info.  I will have to do some experimenting once I start buying track.

Mike-

You could wore them to one button, but I do not plan on doing so since I would be unlucky enough to have another train waiting on the side I wasn't uncoupling, and would then uncouple something I didn't want too.

You're most welcome.

Mike:

I recommend against that for the reason Sinclair said above, plus there's the extra current draw from the second electromagnet.

You should place the uncoupler beyond the fouling point ie. an uncoupled car has to be dropped beyond the point where it will be hit by a train on the other leg of the switch.