These are the sliders. They physically guide the train along the rails. They are visible when the train is being held to help you to insert the train into the rails properly.

The issue with the train floating a bit has been fixed yesterday.
https://steamhost.cn/steamcommunity_com/groups/SligWolfAddons/discussions/1/597388699707197841/

Thanks for reporting. That was a well written report. I just fixed it in the dev version. It will be shipped to workshop later this day. It was a problem with our addon's code.

Also:
No, worries about the demo thing. Your steps are not a demo according to our rules. These are reproduction steps which are pretty much required for a good bug report. So good job on that one. :D

We had a case where someone send us a source engine demo file on workshop that would playback the issue in-game. However these are useless for bug reporting, because demos dont work well across multible systems with different addon setups, maps, game versions etc.

Demo playback is pretty much useless in GMod sandbox anyways, so I don't know why it even is a thing.

Yesterday we have finished a fix for this issue. It took us a bit longer than expected as we wanted to make sure that our fix did not break anything else. If everything works to plan it should arrive later this day.

@MoC Chaos:
No worries, the fix is on it's way. It took a bit longer than expected as we wanted to make sure that our fix did not break anything else. If everything works to plan it should arrive later this day.

That's interesting, lol. We will take care of it. You will be able to use both addons without having this issue soon.

What's the name of that addon?

@TB7 Productions: Please still check for addon conflicts. It can be caused by another addon as well.

Closed as duplicate.

Please take a look at this:
https://steamhost.cn/steamcommunity_com/groups/SligWolfAddons/discussions/1/597388807236538786/

Your game or server was outdated. When we set the min version we verified it to be most current version on all branches. Please verify the game files on the client and on the server.

This infomation is for another addon of mine, but also work for SW Addons. Please read those:

3D Stream Radio Discussions - [Help] The addon says the GMod SERVER is outdated and refuses to load.
3D Stream Radio Discussions - [Help] The addon says my GMod CLIENT is outdated and refuses to load.

The tool was updated yesterday. The TA-Tool developer took care of this issue, after we have reported it to him.

https://github.com/dvdvideo1234/TrackAssemblyTool/commit/9660cb2e385ddd2da36853022238840e7f3d8aea

You do not need to delete this.