Error When Laying Long Streches Of Tracks!

Hello! I keep having the editor crashing on me with the following error: "Save aborted. Levels must be made visible before they can be saved."

Am I doing something wrong or did I miss some steps somewhere?

 

Check to see if that long stretch of track extends in to an area where you have not generated tiles.

 

I have created a very huge flat terrain according to UE's guide of creating a flat map. or is "tiles" something else?

 

I think you want to watch this whole thing.

 

You need to generate tiles specific to TSW4. There are track tiles, scenery tiles, etc. As Tomas9970 recommended, follow along with Lukas as he demonstrates the basics in the YouTube video on track and signals.