Step by step Instructions for raise/lower track merging.

Start out with two separate tracks meeting each other.

1) Elevate a piece of track on the destination (to) track
2 & 3) Build backwards one piece from the elevated track.
4) Recolor the just-built piece to a color different from the rest of the track.
5 & 6) Lower the elevated track back to the same level as the rest if the track
7) The train should go from source track to the destination if this works.

Illustration:.