Custom Created Animations: Created Animations Positioned Weirdly When Loaded Into Object

What are you attempting to achieve? (Keep it simple and clear)

I am attempting to use Roblox’s animation system to “animate” a coaster train around a track. I am not using the Animation Editor, but manually creating the Keyframes and Poses necessary to build an animation.

The coaster train is rigged using Motor6Ds. All moving parts are welded via Motor6Ds to the HumanoidRootPart.

What is the issue? (Keep it simple and clear - Include screenshots/videos/GIFs if possible)

When I load the animation into the train rig (through the default Animation Editor plugin just to make sure it looks good), instead of positioning the train where I wanted it to, it ends up looking like this:

The yellow bricks are the actual positions extracted from the keyframes and where the train should be positioned.

What solutions have you tried so far? (Have you searched for solutions through the Roblox Wiki yet?)

I’m not sure if I am understanding the animation system correctly as there is little documentation on the wiki for doing this manually. It does seem to follow the path I set for the most part, but it just doesn’t look right.

Here are some more pics and gifs:

A snapshot of what the animation hierarchy looks like in the animation editor:
https://gyazo.com/c4e626c871106c43197364d4b7c5b82b

The pose hierarchy:
https://gyazo.com/383b9e6fbfaeb37923d8399d434522a7

A gif of an early attempt in action. Still positioned weirdly:
https://gyazo.com/fd738812400f6ee7d595fb4de1562b74

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