https://mods.factorio.com/mod/arrowless-belts

The middle "Lines" version is the only one I care about really in case that helps: https://assets-mod.factorio.com/assets/11232a568b83f4e14ea2dd5611e46231a02ef29f.png

Yeah, came here to suggest the same.
I'm using Arrowless Belts and think it would just make the game really shine to have that one, plus this, and the Black Rubber mod all together.
Would that be possible? :)

https://mods.factorio.com/mod/arrowless-belts

Hey npuldon! I've updated my mod Black Rubber Belts - Remastered to include arrowless belts's middle lines as arrow styles.
Not only that, but the mod also features toggleable glow options for arrows. So, you can have a glowy middle lines on your belts! Check it out :)

Love it in general. Thank you for combining these features! If I had any 'even better if' statement it would be to perhaps tone down the brightness/color saturation on the thick line belts (the ones I typically use) and make them closer to the 'arrowless belts' mod's more subdued coloring which is a little easier on the eyes IMHO (and a little closer to the greyer factorio default styling).

Again, cheers and thank you!

For comparison
Your mod: https://assets-mod.factorio.com/assets/63810c906546457e0fdb84b8e12c01823f8d1dbd.png
Arrowless belts: https://assets-mod.factorio.com/assets/11232a568b83f4e14ea2dd5611e46231a02ef29f.png

Glad you like it

[...] tone down the brightness/color saturation on the thick line belts (the ones I typically use) [...]

Yes, I agree with your opinion, the thick arrow is very bright... I haven't had a lot of time to try and fix it yet, but I'll give it a go this weekend.
EDIT: I've uploaded a patch toning down the brightness to make it less hard on the eye.

This is awesome. Thanks to both of you guys, looks amazing!

Glad you like it

[...] tone down the brightness/color saturation on the thick line belts (the ones I typically use) [...]

Yes, I agree with your opinion, the thick arrow is very bright... I haven't had a lot of time to try and fix it yet, but I'll give it a go this weekend.
EDIT: I've uploaded a patch toning down the brightness to make it less hard on the eye.

Looks great! thank you!