This is a totally unbiased suggestion, but cool transport is cool. It's basically an overhaul to minecarts, allowing them to be faster (mainly with the Furnace Minecart now being twice as fast as powered rails) and bring along multiple passenger or chest carts by linking them together with chains.

Almost every feature is configurable, and even works mostly server-side (the chain render being the main thing that wont work without the mod on the client, but there are some other things too).

It isn't approved on Curseforge yet, but this is the link for when it will be.
https://www.curseforge.com/minecraft/mc-mods/cammies-minecart-tweaks

If you wanna test it before it's approved on Curseforge, you can download it from Modrinth here.
https://modrinth.com/mod/cammies-minecart-tweaks

It's finally approved on CurseForge \o/

There's a new update out that fixes a lot