The big difference between Iportal and Portal is: with an Iportal the emeging train can be set to automaticly continue driving all on its own on AI...but with Portals the train stops as a default and requires you to assign a driver and start it running again.
I was going to try merging my 3 seperate segments of my Horseshoe Curve routes together...but now I think I will keep them separate routes, because of each of their monsterous sizes.
I used "Iportal Tunnel" and it worked great...I sent a train from one of my other routes into the tunnel, and then I closed that route. When I opened up my "New Route", one minute later the same train from the previous route, now emerged from the new route "Iportal".
This means that I can now divide my Massive PRR Horseshoe Curve DEM route into many, many seperate routes...and for example: Send trains up the East Slope into the Tunnehill Tunnels...close that route...and open up the West Slope route and the same train now emerges from the West Slope-Galitzin Tunnels.
IM me if you need information how to do this: Iportal thing
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