Nasty jolt and I don't know why.

I was working on a suspended coaster earlier and during testing, I noticed a spot where the Gs seemed weird. At first I thought it was just a little wiggly from the swinging, but I had to slow it down to .25 speed in order to see that there are two tiny jolts that are reading around 2+ lats in the back... maybe worse. it happens so quick I don't know what the number is, but it's in the red. It would have been completely unnoticeable if I hadn't slowed it down, although the jerk itself is kinda clear at normal speed... not the Gs.

I really don't know what is causing it! It's a piece of track that happens to have been made with the in-game FVD, it has been further depumped (now many times after noticing the issue), the radius comb looks normal, roll points look basically correct, and the G-force comb doesn't show any spikes even though it happens in the middle of the train too. The track looks perfectly normal when frozen.

Here are some pictures. I know they're not the best but it happens in a really small stretch of track and I was trying to focus in on it, which was not easy.

Any ideas?

What you're experiencing can't be fixed just by smoothing track. The simulated swinging physics with the Suspended coaster type in NL2 is absolute crap. The swinging is unrealistic and the engine that determines the swinging is completely f***ed up. Right now, there isn't really a way to fix that. You're probably going to have to re-profile that entire area until something works out. Good luck.

Yeah, I know the swinging physics aren't great but I swear that doesn't seem to be the problem. It seems to be coming from the wheels/chassis and not from the swinging, besides the fact that by that point the train really isn't moving very quickly or swinging as much as it might. I'm going to have to redo it anyway, but I really don't think that's it in this case. I have had other lateral force problems caused by the unrealistic swinging physics and this is not behaving anything like every other time that's happened.

I'm wondering if it could be something to do with the in-game FVD having a problem with custom off-set spline positions. I had X set to .45 just to fool around... IIRC I've seen that number suggested by someone for Arrow shaping. (Whether or not that's right for suspended coasters is pretty inconsequential, I don't know if I'd keep it nor am I planning on releasing this.) I'm not sure, though, since I did make a decently long piece of track using the fvd and that's the only spot this comes up.

Try lower the spline offset. I haven't had any problems with .45 offset but when you go any higher you get huge pumps when banking.

I will try doing that and see what happens, although it's definitely set at .45 so based on what you said that shouldn't cause an issue... but maybe it's a combination of the spline offset and the swinging both.