"Down the line running is Kim" is not right. "Running down the line is Kim" is possible; it might used if it was already known/apparent that someone was running down the line, in order to identify that person as Kim.
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moon7296Down the man came from upstairs.This is a slightly unusual word order. It might be used in a story for colour or variety.
moon7296 Ah Okay. Then can I say "Coming down from upstairs is/was John(or the man)" assuming that it was already known that someone was coming down from upstairs?Yes, that's possible, but "The person coming down from upstairs is/was John" would probably be more common in this situation.