it keeps standing still, tryed with less carts, it wants to go forward but keeps struggling

this is the error

[15:24:21] [Worker-Main-6/ERROR] [minecraft/TagLoader]: Couldn't load tag [betterminecarts:glowing_rail (from betterminecarts-1.20.1-1.8.1-47.1.0 (1).jar)] as it is missing following references: betterminecarts:glowing_rail (from betterminecarts-1.20.1-1.8.1-47.1.0 (1).jar)

this is the warn

[15:24:28] [Server thread/WARN] [minecraft/SynchedEntityData]: defineId called for: class net.minecraft.world.entity.vehicle.AbstractMinecart from class hu.xannosz.betterminecarts.utils.MinecartHelper
[15:24:28] [Server thread/WARN] [minecraft/SynchedEntityData]: defineId called for: class net.minecraft.world.entity.vehicle.AbstractMinecart from class hu.xannosz.betterminecarts.utils.MinecartHelper
[15:24:28] [Server thread/WARN] [minecraft/SynchedEntityData]: defineId called for: class net.minecraft.world.entity.vehicle.AbstractMinecart from class hu.xannosz.betterminecarts.utils.MinecartHelper
[15:24:28] [Server thread/WARN] [minecraft/SynchedEntityData]: defineId called for: class net.minecraft.world.entity.vehicle.AbstractMinecart from class hu.xannosz.betterminecarts.utils.MinecartHelper
[15:24:28] [Server thread/WARN] [minecraft/SynchedEntityData]: defineId called for: class net.minecraft.world.entity.vehicle.AbstractMinecart from class hu.xannosz.betterminecarts.utils.MinecartHelper

yes srry for the log time, i didnt see it, it has the locomotive yes infront, and it looks if it has an issue with chunk borders or something

Hi, sorry for late response. The error is not a problem it just a missing but not used translation tag.

I try to reproduce the warn, but I can not. Some questions:
Can you try it without cars?
Can you send me a list from your other mods? (maybe it is an incompatibility)
Are you sure, your locomotive is the head of your train?