Help:VE283
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Bone '<bone>' parent mismatch between LODs: <lod1>: '<parent1>', <lod2>: '<parent2>' (in <file>).
The named bone has a different parent bone in two of the mesh's levels of detail (LODs). Trainz expects every LOD of a mesh to share the same skeleton hierarchy, so that animations behave identically no matter which LOD is displayed.
Check the skeleton in each LOD and make the parent of the named bone the same across all of them, then re-export.