Likely software rendering. My guess is that you accidentally disabled gpu passthrough.
The error in the screenshot suggests some libraries have been compiled with a more recent version of glibc than the one in the linux container. Try updating it.
Some maps already do that by adding empty actors that play a sound. Better approaches are probably possible with scripting.
Should be possible with scripting, though performance would probably be quite bad.
see https://github.com/RigsOfRods/rigs-of-rods/issues/3347