[Fablok]

I have reworked all activities for this route. In this one only change was adding waiting point for player. If You want I can send to You that act after my tuning.

[R H Steele]

Besides rewriting parts of the activity (which sometimes has to be done ) try this....
After picking up caboose, switch to manual mode.... That should give the yard switch to the arriving Zephyr and the road power (see DispatchViewer screenshot taken in activity)
After the Zephyr and road power pass throw the switch for the player and enter the Van Camp/Pg&E siding. (by staying in manual you'll miss the reverse point to enter VanCamp but that;s okay - for OR that's really an irrelevant addition)
I believe you'll need to be in manual mode to pick up the Pg&E cars anyway.
After picking up the PG&E cars and the caboose on the rear, switch back to auto mode and you should be okay for the rest of the activity.

I really do love this flexibility with OR, it enables you to take control and get around having to rewrite activites. Although, in some spots like passenger activities I can see where it might upset the timing quite a lot,

(please ignore my speeding in the yard - I usually try to keep it around 5 to 15mph)

Edit: I added screenshots of the CZ passing after the road power had already entered yard -- this is in manual mode.
next screenshot shows OR back in auto mode, signals correct and reverse point present --- this is probably the way to go.

LAST edit: Nope I was wrong, stay in manual after the road power and CZ passes, throw the switch (your path will go right into VanCamp) and TAB the signal to yellow...in auto the path throws you OOCH! (out of control, heck)
Also, when I picked up the caboose I did not put any air on it, that way it was easier to drop at Van Camp. I do love the new brake implementation.

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[R H Steele]

I did some more tinkering and it appears that the shortness of the path and the reverse point in the VanCamp siding area is causing the "out of control" path problem.
I removed this reverse point, the path now goes straight past VanCamp to the PG&E Rodgers siding.
I left all the reverse points from the path start to VanCamp intact.
So it works fine, if you run Manual mode after picking up the caboose. The road power and the CZ pass and enter yard - tab through signals, enter VanCamp, pick up cable flats, and reverse back to main line.
Switch to auto and finish the run.
Someone with more activity writing knowledge than I could provide a more elegant solution.

(I didn't understand Fabloks post about the waiting point, perhaps that is a better solution)