Describe the bug
A clear description of what the bug is. Trains will not work at all in multiplayer. But strictly multiplayer.

How to reproduce
Steps to reproduce the unwanted behavior:

1. Load into Multiplayer in any gamemode
2. Build any sized rail line, and attempt to use a train on it.

Expected behavior
A clear description of what you expected to happen.
The train will not run, neither with, or without fuel requirements.

System Information
OS: Windows 10

System Memory: 32 GB

Allocated Memory: 8 GB

CPU: Ryzen 7 3700x

GPU: Gigabyte 3060

Game Version: 1.16.5

Forge-Version: 36.2.20

Modlist
Provide a list of the mods you used. You can either directly write them in here or use an online service like https://pastebin.com/ and provide the link.
Appleskin
Clumps
Create
Curios API (Forge)
Enhanced Mob Spawners
FallingTree
Flywheel
Immersive Engineering
Immersive Railroading
JourneyMap
Just Enough Items
Natures Compass
Optiforge
Ore Excavation
Performant
Puzzles Lib (Forge)
Silent Gear
Silent Lib
Silent's Gems
Sophisticated Backpacks
Structures Compass
Track API Universal Mod Core

latest.log
Provide the latest.log by going into your Modpack_folder/Logs, paste the contents of the file to an online service like https://pastebin.com/ and provide a link.
https://mega.nz/folder/m81llKpB#lljZZXteFHYlYMDt0skhsA

Additional context
Ive tried to drive the Ten-Wheeler, Big Boy, and A1 with this issue being apparent on all 3. They just stay still and wheelslip infinitely.

Wheel slipping with trains on servers is usually due to the server not having fuelRequired set to false in its copy of the IR config file.

That's not the cause. It's a mod conflict or using a plugin server.

Do you have any clues as to which mod it could be?

Does it do it single player?

Just to confirm, you have restarted the server since changing the config, right?

It doesnt occur in single player at all, and im about to restart it again just to be sure.

Just did a server restart, its still doing the same thing.

I just edited the config and set it to false, still got the same bug, I might have phrased it wrong, but the trains just will not move period, but they do the animation like they are.
Aswell the audio for them is working.

Is the server a forge server or a hybrid server?

Im checking some of the datalogs now and its registering the trains as an "unknown entity", that probably has something to do with it.

Its a forge server, im using Apex Hosting if specifics are needed

Ok. Turns out im an idiot, Got home from work, and messed around the server config. It didnt take the file for the IR config because it had a (1) Next to the name due to me being an idiot and copying the file twice. The issue is resolved. Thank you for being patient with me lol.