There are many variations - tubular track, t track, kit built and so on. I recommend this video set to get an introduction to all of that: https://www.amazon.com/s?k=%22...p;ref=atv_dp_pd_star
For what it is worth, here is a (poorly scanned) copy of the kit instructions hosted by Lionel:
https://www.lionelsupport.com/...5009242014142924.pdf
And finally, if you are a member of the LCCA or otherwise have access to the corresponding catalogs, I'd recommend browsing those as well.