You need to check your clearances with the various tracks cross. The track from the helix exits at a 6" height after crossing under the branchline track which is also at a 6" height. Modern locomotives can function very well on a 3% grade.
As I said above, The elevations have not been set. The 6"number is arbitrary and not what it will wind up being.
"I attached the Anyrail file, but just be aware that I don't have all the elevations done yet so it only works in the 2D view not 3D."