Here a little Test of a 32k Texture for SimTraxx Semetin Track.
https://drive.google.com/file/d/1oS0Fj3sjWuLa1vP2Bn4ao3Yuu99ioRvP/view?usp=sharing
I split the ground in 4 parts and use 4 x 16k textures....little bit more details, but maybe not worth the work. ;-)
p.p.s. for this you need enough VRAM....extra 0,5 - 1 GB!
BACKUP YOUR "simtraxx_semetin.kn5", this file will be overwritten, because it´s not only a texture!!!!