I've been googling for information about this for a long time, but the only thing I can find on this topic
https://www.gildor.org/smf/index.php?topic=6331.0 The information in that topic is too old to adapt to the Train Sim World 2020 and the problem still exist: skeletalmesh & animation can crash the umodel. The error always same:
SkeletalMesh 
Animation
I tried many versions of the UModel, including the latest version,umodel just crashes when I trying to export any skeletalmesh or animation.
Currently,UModel(Latest Version) can successfully export following resource from Train Sim World 2020: Textures,StaticMesh,Sound.
So, could you make the UModel to fully support Train Sim World 2020? Also,if you need some sample assets file,I can provide some.
Game Information for Train Sim World 2020
Game publisher:Dovetail Games
UnrealEngine Version(Currently):4.16
Game's Main executable file info: