The robberies happened Aug. 6 at Chester station and Aug. 26 at Christie station.
In both robberies the man, heavily disguised and wearing a bandana, approached the ticket window with a semi-automatic handgun. In both cases he demanded cash and fled with money and Metropasses.
Both robberies happened some time after 11 p.m. No one was hurt in either robbery.
Police released a photo of the suspect taken from security camera footage.
Police believe the same man is responsible for both robberies due to similar suspect descriptions.
He is described as white, 25 to 30 years old and between five foot 10 inches and six feet tall. He was wearing a single white garden glove with a grey palm and a black hooded sweatshirt.
Staff Insp. Mike Earl said it’s unlikely the August robberies are connected with a similar armed robbery in February 2012 at Dupont station in which a TTC fare collector was shot.
The TTC worker was hit twice but survived. The shooting remains unsolved and the TTC has posted a $25,000 reward for information about that shooting.
The suspect in the Dupont shooting was described as shorter — about five foot two and five foot five inches tall — with a heavier build. The gun used in the August robberies was a semi-automatic; a revolver was used in the Dupont station shooting.
Earl said police are asking for the public to provide them with information that will lead to an arrest before the suspect strikes again.
“We’re trying to nip it before he gets carried away,” said Earl.
Anyone with information is asked to contact police at 416-808-7350 or Crime Stoppers anonymously at 416-222-TIPS (8477).