http://www.cbc.ca/news/canada/calgary/ctrain-groping-suspect-sought-december-2015-1.3383609
Based on CCTV footage of the suspect's behaviour, investigators believe the victim was targeted because of his special needs.
The suspect is described as about 35 to 45 years old, standing about 5 feet, 10 inches tall, with brown skin and dark hair.
He was seen wearing a dark-coloured tuque, along with a dark-coloured hoodie, blue jeans, black hiking shoes and a dark grey or dark blue winter jacket with white trim down the sleeves and across the chest and back.
Anyone with information about the incident or the person in the photo is asked to contact police at 403-266-1234 or Crime Stoppers anonymously.