Does anyone know how to model in the TSW4 editor? (Create stations in 3D editor) I can't really figure it out. but I do need it for, among others, Münster station (Westf.) and all roofs at the other stations. If anyone knows this, it can help me a lot.
if you need external models and are not happy with vanilla assets, you can use Blender. then somehow import it into the editor and use it.
I think that if you seriously need to work on custom assets, you will have to make them in Blender as UE4 doesn't have built-in 3D modeling tools. Third-party software is just better at certain tasks so there is no need to integrate these tools into UE4.
Make your custom assets in an external 3d software like Blender. Once complete you export them in Fbx format and then import them into the editor. You can do this by grabbing the fbx file from a windows folder and dropping it into the Content Browser
UE4 have a Modeling Plugin, but if you activate it, then the Editor Crash and it is Beta. And the UE5 Modeling plugin is much better, i use it on "The Bus" Modeditor. Better using Blender.