How to increase "god rays" impact?

Here I have some nice renders with fog interacting the native distant OV light, also called as “god rays”:

https://forums.developer.nvidia.com/t/cc-charater-with-smooth-refinement/198142/5

How can I increase this effect on air? I know I can increase the intensity of that distant light, but it is not affecting then so much more in my scene..

How can I increase the “thickness” of the fog that is catching the light?
I do not want to increase the amount of the blue fog in the train interior, since too much is too much.

I know this is kind of a kinky question, since RTX Path traced renderer tries to imitate real light, but still there must be some trick to do this right?

I got it!
Assymmetry (g) was in key role in fog settings:

Most effective single setting, set the Diffuse multiplier to 0 for the distant light: