TheDieselShop has a U18B production roster, which includes the original owner, at
http://www.thedieselshop.us/GE_U18B.HTML
and a Pickens roster at
http://www.thedieselshop.us/Pickens.HTML
The listing of Preserved 1st Gen. GEs shows
no U18Bs:
http://www.thedieselshop.us/PRSVDge.HTML#Road
/Ted