RCT2 Importing

Does anyone know how to (if possible) get a Roller Coaster Tycoon 2 track to import into NL?

No, just RCT1.

Aren't they backwards compatible with RCT1 if it's a supported track/train style? If so, I'm sure you could import them into RCT1 and then put them into NL. However, I highly recommend against doing anything like that - RCT tracks are notorious for getting ranting reviews on the exchange...plus they suck. You should learn to design in the NL editor itself.

No, only RCT3 can import RCT1 & 2 tracks. No backwards compatibility between 1 and 2 on their own.