Other than what flew through the newswire, I was finally able to watch the 188-Minute version of "Superman - The Movie" from 1978. I swear this must have been a workprint version that predates the 2000 Director's Cut & is called the "Salkind International Extended Cut" that aired in 1994 on KCOP in Los Angeles, CA.

At first, I thought it might have been a bootleg, but I found out it was in WB's vaults and restored for a BluRay release.

Quite a find and has the original SFX track intact.