Can I buy more raíls to enlarge my set?
JP of Acton MA, USA writes,
Williams by Bachmann sells O gauge EZ Track: https://shop.bachmanntrains.com/index.php?main_page=index&cPath=491_885.
For traditional tubular track, all they seem to be advertising are curved tracks and uncoupling tracks. The tubular tracks are compatible with Lionel O and O27 traditional tubular tracks.
If you currently have tubular tracks from Williams, you could simply use Lionel tubular tracks. Just my opinion.
-JP