Hi,
I have quickly updated my old TrainDriver plugin to work in R20 - R23.
Chain up trains and let them drive on splines! Also great for roller coasters.
https://github.com/fwilleke80/TrainDriver/releases/tag/1.2.1
Builds for Windows and macOS. The Mac builds are notarised and support the M1, too.
Cheers,
Frank