If you were wondering why your Red Line train may have been delayed on Thursday morning, don’t blame it on the MBTA.

Police are asking for the public to identify a shirtless man who was wandering down the tracks around 7 a.m., causing T operators to stall their arrivals for roughly 20 minutes. Video surveillance footage captured the curious suspect walking—and then running— on the northbound tracks between Andrew and Broadway Stations.

“If you have information about this person who disrupted Red Line service [Thursday] morning, please contact Transit Police at 617-222-1212 or use the See/Say app,” MBTA Spokesman Joe Pesaturo said in a statement, hours after the incident occurred.

In the video, the man can be seen walking through the station, as customers are sitting on the bench, before hopping down into the pit. Once in the pit, the man begins to jog.

An MBTA spokesman said the train-track walker left before he could be detained by Transit Police Officers.

Last month, customers experienced hour-long train delays at South Station when a homeless man decided to take a snooze in the middle of the train tracks.

Both incidents could be jotted down and recorded in the books for the weirdest MBTA delays and commutes.