Reuploaded LocoRico flexible brio compatible train track from Thingiverse, original URL is https://www.thingiverse.com/thing:5019335 . Check that URL for licensing requirements (currently, but this might not be accurate when you're reading this, it's a Creative Commons - Attribution - Non-Commercial license).

I printed these in wood PLA with a 0.28 mm layer height and a 0.6 mm nozzle which turned out fine.

LocoRico also has (as of this writing) an Etsy store at https://www.etsy.com/fr/shop/LocoricoTrain and also sells these on Amazon.com.

I am not affiliated with neither LocoRico nor Brio.