Chip, one point I'd like to make is that if the distance between industries was that short, chances are the product would be trucked to it's destination.
Here's what I'd do- pull the first car and set it claer of the switch, pull the car to be set out, and couple to the car set out just before, shove it back on track 6, then back the car destined for 4 onto the left leg of the wye. Run clear of the switch and back down the bottom leg onto the main. run up the main and back down the other wye leg (remember our train is still here) and back up into 4 as the car to be setout is at the end of the train.
Gandy, I agree! It's much better.