Kevin, I'm not sure which version you're referring to as KM3 as I don't see one attached in this thread and I've been working with KM4. I'm not sure it matters though because I think the main track configuration is the same. The only changes I've made to the main layout is to relocate some turnouts. I've also reconfigured the yard and grade tracks, but those aren't the problem at this point.
To illustrate, I've hidden everything but the main tracks so you can see what you're up against. I filled in the bench work and extended it to G-140. The loops at each end are O72/O81 and you can see that they simply won't fit the space in the lower left unless you modify the bench work.
Here's what needs to happen to make the loop fit.
Or something like this. But, you can see by the Blue track how much space is needed for the grades to the bridge to be less than 2.5% (2.2% upper/1.6% lower left) and I haven't even looked at the grades down to the yard yet. It took quite awhile to get to this point because I played with the over/under too long before I gave up. My goal here became to start with something more straightforward to build on. The problem is there is really no place to put the turnouts down to the yard and I'm not at all happy with the crossover or the turnout to the TT all being in the same spot. I'll try expanding the G-140 area to the walls, but I don't think that's going to make much difference.
And, no, I won't be at York.
