Amazon.com: LEGO City Tracks 60205-20 Pieces Extension Accessory Set, Train Track and Railway Expansion, Compatible with LEGO City Sets, Building Toy for Kids, Great Gift for Train and LEGO City Enthusiasts :
Fx Track ... LEGO 9 V train compatible track system by Fx Bricks - YouTube
This Old Track: Maintaining and Restoring Metal 9V LEGO Track - BrickNerd - All things LEGO and the LEGO fan community
BrickTracks | LEGO-compatible train track
5x and 10x Technic track compatible sprocket wheel - no supports needed by Jens83 | Download free STL model | Printables.com
Track Planning – MattzoBricks
L E G 0 compatible train set supports great with Track set 60051 60052 60198 ID3 | eBay
Third party track – A review of the options | Brick Model Railroader
Third party track – A review of the options | Brick Model Railroader