The leg of the crossover needs to connect to the main track over an unbroken section of track ribbon. Those little red triangles show that the main track was made in several segments, or cut and welded back together.
1. Delete the leg of the crossover that isn't connecting properly.
2. Use the split tool to separate a section of the straight track on either side of where the crossover will connect back in. (see picture)
3. Delete the section(s) of straight track you just split from the main ribbon.
4. Lay a new, unbroken section of straight track using the 'snap to track' function.
5. Lay the leg of the crossover again, using 'snap to track'
20171128160635_1.jpg
I hope that helps!
Are you building the old MILW branch to Snoqualmie Falls?
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