Perhaps the mysterious World's Fair E unit might be more interesting if it could be brought to life - how about some Kodachrome footage in beautiful condition to liven things up?
https://www.youtube.com/watch?v=WT8piY6kYNo
On a World's Fair related video note, here's a lengthy color segment of trains from a different source (sorry, no E unit close-ups here), but nice shots of a streamlined NYC Hudson and Pennsy K-4s meeting up, the S1 on rollers, The Coronation Scot streamliner, 2 toned gray NYC streamlined cars: