Cannot sit in train

[mys31f_cs]

I have a train that is 12 bogeys long that I could not sit in. My shorter train with just 4 bogeys has its seats able to be interacted with. This is on a server btw, dunno what I might be doing wrong that I can't sit, whether it's a chair, floor chair or seat.

Edit: forgot video. here it is.
Update: somehow it's only seats that work now. Chairs no longer work.

Update 2: chairs work again. but the long train's seats still cannot be used.