Thank you for your comment. RS-4 does not appear in the TV drama Seibu Keisatsu. I thought it would be nice to have something like this, so I created it with the livery editor.
@@Game_SuRonin Ah I see. Thanks for the explanation. I actually thought for a moment RS-4 may be a refurbished Machine RS but I later realized Machine RS is already renamed to RS-3...