This track is from "Alchemy: An Index of Possibilities" - David Sylvian's second solo album, released in 1985. The album was originally released in 1985 only on cassette - the recording you can hear in this stream is the full version from the original cassette.
Also involved in the recording process were Holger Czukay, Ryuichi Sakamoto and Jon Hassel.
"Steel Cathedrals" also is the soundtrack to an ambient-film by David Sylvian bearing the same name.