Become Gromit in The Wrong Trousers, by automatically lay tracks in front of yourself.
Also works from inside a train or car! So you can be driving on the track, and automatically build new tracks in front of the train!
The infamous part in The Wrong Trousers: https://youtu.be/jrmZIgVoQw4?t=94
Download the source here https://gitlab.com/TheOddler/factorio-auto-track-laying and I'm happy to consider any merge requests too.