Police say a woman was riding on the light rail on December 10th in the area of 25th and Welton.  She noticed the male was sitting nearby her and was masturbating while looking at her.  She turned her telephone on and captured an image of the male.  The victim exited the train just prior to the Downing Station and the unknown male remained on board.  Anyone with info is urged to call Crime Stoppers at 720-913-STOP (7867)