I have a few pics.
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This is an exploded station. The main components are there, but not connected. I joined them with Jungfrau Busroute so I could run a train through it and get a close up view. The main pieces are the station, the platform start, platform end and two pieces of platform spline.
Select a station and place it on the layout. Add the appropriate platform start and end pieces, spaced as far out as the desired length of the station. In this case, I made it about 620 feet.
Join the end pieces to the station with the platform spline. The station will change to match the spline platform.
Next, join the end pieces to the station with the track. The end pieces will change to the selected track. Do this before you add the tunnels to the outside, or you'll have walls along the platform inside the ends of the station.
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Here's a completed station with the pieces for the tunnel. There are two different types of single tunnel. Here you can see the adapter that connects them.
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A short piece of adaptor is used to join the normal tunnel to the one-sided tunnel to make a junction as we open up to a four track mainline. Once everything is connected, the adapter tunnel will be moved on top of the other line to hide the cheat. It's easy to move it too far and reverse the lines so the train goes left with the switch set for right. Test and adjust. (A good excuse to play with the trains:hehe: )
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There are three types of 4 track tunnel. One is the standard tunnel with three rows of pillars, the other are missing the pillars in the center row or the two outer rows. This allows junctions to be made inside the tunnels.
I hope this helps you get started. I'll try to finish the route and upload it this weekend.

Claude