Hello,
Markbin & Peter,
I have for my use used shells like Peter tells about to make the junction works.
A look at at a complex junction can be seen below:
This one would been impossible to make with splines only, and even this setup type have the problem of light leaking in from time to time.
That is the reason the tracks has this ears hanging out, also to be found at each junction model.
But, this shell is rather tricky to setup, it involves uses of (in my case) use of two types of spline track, as one is rather heavy in polygon due to very short segment length and used in the curves, and one is slight less heavy in polygon and used for the straight part.
It also involves some fiddling with the spline points as Trainz don't support two connection of splines to one fixed attachment point.
All this makes it a little complicated to explain, and as I don't want to get risked drowning in emails to support it (someone claimed the mine tunnel was much sought after, hence, me afraid of the drowning part.. LOL), I never sent off the shells to make the junctions.
I wanted to see if the tunnel spline it self made any show of use, and from that judge how important any junctions would be.
The industry part I'm having problem with due to me and script not being friends - hence, that is also held back.
The idea of using a half walled spline is a good idea however, for some uses, but I decided against it when I first made this system back in 2004/2005 as it was way to much work making the walls line up.
My first junction model used a trackside item as a cover and normal spline to setup the junction through the use of a scenery item as a template.
Become to much work/hassle, so I ended up with the kind buildable as shown above with a few pieces of track attached to it, and then use rail only spline track to make the junction parts.
I see now that I spend as much time typing in stuff here in this thread as I feared I had to start spend making support emails - so maybe I should start to think up a better solution if the need for junctions to my tunnels are that big... :hehe:
To bad I can't trade my models against script services... :wave:
Anyway, I'm keeping busy with my Cripple Creek stuff, scanning through pictures and making a system to keep track of what I have of images, info and so on.
Trainz is low on my list, I read the forum, type in a few things from time to time, but that is it.
Sorry Peter, all I want is that electric trolley locomotive of yours, not the whole Chicago...

Guess it is with so many other things, many want to play with it, a few wants to build for it.
Either way, I need to get back to my pictures before they all fade away (I have that problem with some of the old stuff I got just before Christmas 2008, they are already very faded and hard to get fixed)
Sorry I can't be of more help at this time, but it sure looks like this thread has spurred others to pitch in, so that is great!
Best wishes all
Linda