Night Train evolved into The !!! Beat but they are different shows. Night Train is black and white, has this weird sort of staged thing going for every performance where you don't even see the set, and all the songs are covers of other songs.
The !!! Beat is color, has a great 60s looking set, and the artists do their own material. Supposedly the episode with all the chicago people (radiants, mamie galore, etc.) came from a big tour that was passing through town and they got scheduled on the show.