Railroads are also there for the public good. That is why they also have the right of eminent domain. An agency with the right of eminent domain may not use that right to take property from another agency with the right eminent domain. If that were not the case two agencies that wanted the same property would just sit there taking the property back and forth. No judge would stand for that. If the LA Olympic people want the UP's property, they are going to have to put so much money on the table that the UP can not say no, or apply political pressure to get their way. My guess is the latter will be the most likely course.