I repeatedly attempted this after discovering it. Beware though because parts remain that can't be deleted!
Place a fixed track asset, or mo-crossing asset such as a level crossing.
Delete it.
Spliney parts remain and can't be removed but they can be updated using the update/replace assets utility.
Place a fixed track asset, or mo-crossing asset such as a level crossing.
Delete it.
Spliney parts remain and can't be removed but they can be updated using the update/replace assets utility.