VERY important point you missed on that front - most of the donated engines (which did happen a couple times IOTL) weren't so much for display purposes as much as for allowing the students of the University to develop skills using the engines. Like Formula SAE and other programs, the universities in question used these locomotives to teach their students. Sometimes this resulted in engines being restored to perfect working order (this is how Pere Marquette 1225 survived IOTL) but in others it means they end up as static displays or sometimes even being used up and then sold for other purposes.@TheMann
Going off what I mentioned about American railroads likewise donating locomotive to universities for display on their campuses, here are some ideas I brainstormed. Some notes regarding these idea do pertain to rail ideas I had, but go ahead and tweak them to reflect your own ideas if you like. Maybe you'll even have some extra ideas for two.