While I’ve played with Bachmann EZ-Track making loops and stuff before, I’ve never really tried to use it seriously for a layout. A fellow in my office is doing a Christmas layout and bought a box of it and asked me to help him design & set up the tracks…
To my surprise the #5 turnouts will accept one track on one leg just fine, but the second leg track will not fit because the plastic roadbed needs to overlap the roadbed from the first leg. Then I thought the small extra piece of track that came with the turnout would be an adapter for this - NOT. It is apparently a spacer to add to a normal 9" straight to make it the same length as the turnout.
So, How have other people dealt with this? Just cut off the extra piece of plastic roadbed?
It was my solution, and on the advice of my LHS owner at that, TZ. Use sidecutters or sprue nippers and cut along an outline you will have scribed onto the turnout’s roadbed when you overlay the piece that won’t fit. It’ll work nicely once you have the first one figured out and in place.
You might want to check the track that came with the turnout again.
With the Bachmann No.5 I bought, there was a short section of straight track as you describe, that connected to the straight leg of the turnout. It came with the ballast cut back on the side of the straight track that goes next to the curved leg, so that I could put a curved or straight section into the curved section of the turnout with no problem.