@ Dave
Dave,
You have certainly given me a lot to think about (again!) with your post. I'm not complaining though. I LOVE IT! As I've mentioned before, the fact that you not only read my post, but give thought and attention to all the details never ceases to amaze me! A simple "thanks" can't even begin to express my gratitude.
Now, to try and answer your questions as best I can. Since making this post a while ago I tried out my operational ideas just to see how they would go. As expected there were some glitches which necessitated revisions, but I didn't take the time to post those revisions. Also, because I've been busy lately with getting some scenery construction done, it's been a while since I've thought about operations, but here we go.
One thing to remember is at this point most of my operating is done solo, or at best with only one other operator, who is still very inexperienced. When he comes over I usually let him be the engineer and I'm the conductor. So in the end it still ends up being more of a solo act. That means some of the issues you raise aren't really issues on the layout in real life.
That being said I am trying to think ahead to the time when maybe there will be more than just one person running the layout at the same time. I envision a yard operator and probably two others running trains according to the latest revision of the sequence schedule.
Assuming that scenario the Tubs Holler and Van Lear shifters would leave Eckman yard. They would probably be out at the same time if I have enough operators with no other trains on the main, unless I have another train just circling the mainline loop to provide traffic. Once the shifters return to the yard they place their loads on the tracks they left empty when they departed. The yard crew sorts them on the same tracks blocking them for east or west bound departure. Then the Williamson and Bluefield coal turns arrive (not at the same time, but in sequence) to pick up the loads, drop off empties on those same two tracks, and then depart down the main.
One thing I decided to modify was the coal turns. Instead of making them turn at the yard, I decided to have them travel between Williamson and Bluefield with only a stop at the Eckman assembly yard. That way they get to traverse the whole mainline of the layout, which I like.
As you mentioned, Eckman siding does seem to be busy, but since only one train is around at a time and the next train in the sequence schedule won't run until the current train has finished it's run and parked back in the staging, the siding shouldn't get overloaded.
The two reasons I like to use the siding instead of the main are: 1) As you mentioned previously, there is limited access to the main. 2) When I put a train circling on the main and just let it run, using the siding let's that train pass without me having to pay much attention to it.
The process I just described for the coal trains is similarly repeated for the Liberty Local and Yard Hustler. They depart from their respective tracks, make their runs, return to the tracks they departed from. The yard crew blocks the cars on those two tracks for departure east or west. Then the merchandise freights (run in sequence) pick up the loads/empties and set out other load/empties as needed.
I do have merchandise that travels both east and westbound. Empty cars route east or west according to instructions on the car pocket. Loads route east or west according to the info on the shipping waybill.
You mentioned flexibility in the yard track assignments. That too got modified with further trials.
YT1 = Empties
YT2 = Eckman Yard Hustler - Eastbound Merchandise
YT3 = Liberty Local - Westbound Merchandise
YT4 = Van Lear Shifter - Eastbound Tide Coal
YT5 = Tubs Holler Shifter - Westbound Lake Coal
YT6 = Engine ready and/or empties.
I agree with you that there has to be some flexibility when it comes to using the yard. But I like to have some general overall idea of what each track is for, if for no other reason than to keep things straight in my head.
As you can see, there are probably a lot more details about operations that I still need to work out. But with my recent modifications, for now things seem to be working fairly well. That may change later, but I'll cross that bridge when I come to it.
That tip you gave about train arrivals and departures being thought of as separate events is really helpful. Up to this point I just thought of a train going out and coming back as a unit, because when you are running solo that's pretty much all you can do. When more operators come on board though, I can see how your suggestion would prove extremely helpful, and even necessary to keep everything organized so yard tracks, sidings, or even the mainline aren't double booked with two trains being on the same track at the same time.
Hope I covered all your questions!