Various websites don't always respond the same to search inquiries. For example, I find Google easier to use to find things here than the specific search function on this forum.
Anyways, I went to Trainworld and instead of using the specific search box, I selected Atlas, then 0, then Track, and here it is... and Atlas 027 (item 6043) curves are listed.
https://www.trainworld.com/sea...tronics=&engine=
The hobby isn't too different from using various web search engines: Sometimes you have to play around to get something to work. A lot of folks dump on 027 tubular track and switches especially, as it is. But again, sometimes you have to play around with something to get it to work.