I converted some of my railroad tracks plus the BR 628 from my RCT3 CT/CTR.
Thanks to RCT3's grid you can build very precise with these pieces (if you turn on Snap and set it to 1m in the preferences).
Simply extract the folder to "My Documents/com.nolimitscoaster.nolimits2" and select the pieces under the section called "Home". An annoying message will appear each time you select a piece but you can ignore it. Simply click on "Yes".
To make this work in parks you share, you have to pack it as an NL2 package. So you are allowed to share it.