Märklin-K series HO gauge track is designed specifically for AC powered, effectively three-rail Märklin layouts. It is only compatible with Märklin-M HO track (the two may be joined through a transition section), and the newly announced Märklin-C track. The table and image below show the components in the RR-Track Märklin-K HO track library.
This track library contains a wizard for track laying automation; items in red are newly added.
The current v5 release build is 4.60.005. If yours predates this, please visit our updates page and download the current release.