O/T: The GAP Band - Party Train

Discogs is confusing me on what the "LP Version" of this song really was:

This release says it was 6:10.

This CD release lists a time of 5:45.

Ron's library lists the LP version as 5:13.
There's a TMC MBD Series "Mobile Beat Best Of Dance 6" file that runs 5:20.
The GAP Band Ultimate Collection has a 4:41 length.
The Best Of The GAP Band / Millennium Collection has a 5:42 - 5:49 length.
The 12" versions run 5:55, a "Special Dance Mix" which runs 6:10, or "The Special Party Train Dance Mix" which runs 7:47.

Of course the 7" was significantly shorter, running 3:59 for both "Party Train" and "Edited Version Of Special Dance Mix."

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I'm wondering:

1) Which version / length was on the original LP version?
2) Did the version on the LP change over time?
3) If the other lengths exist, where did they originate?
4) How many of these have made it to CD?

(This has come up because I have a listener who says the version he "always" heard was the 5:49 / Millennium version, & that's how I fell down this rabbit hole.)

THANKS!!!