This is a paid asset, but now you can download Animated Steel Coaster Free.
Detail this asset from Unity Store: Original Link
Animated Steel Coaster v1.52 (Latest version)
Animated Steel Coaster v1.3
Steel rollercoaster with physics based animation.(baked to keyframes)
– open the online documentation for more information
– Drag and drop prefab with controller script for easy adjustment of trains and animation velocity
– Up to three trains with 5 carts.
– Two LOD levels
(~56 tris to ~580 tris per tile)
– Up to ~400k tris
(depends on quality settings)
– Source tracks included
(low and high detail, length: 5 units,
z forward, y up, 10 subdivisions)
– Sound
– Simplified collision meshes
(not included!) Nature assets from the video:
Nature Pack
Forest Pack