

Thanks for sharing, but I imagine it doesn’t get mentioned as much here because from a privacy perspective, that app seems kinds shady.
No source code available as far as I can tell, no builds available from a reputable source like F-Droid (just unvetted APK downloads from someone’s Google Drive), no apparent issue tracker beyond a confusing and seemingly outdated network of thread links from 2016 on a forum.









The repo README has some example code that looks like it might get you 90% of the way there to implementing railway highlights.
Could be a nice contribution to finish that out and send in a PR!