Calgary Transit says the Blue Line is closed between McKnight-Westwinds and Whitehorn stations and will remain closed until Sunday.
The announcement made on social media states that shuttle buses will operate between the two northeast stations during the disruption.
Train service will be restored at midnight on Sunday.
The closure is to allow for preventative maintenance, including signal and gate repairs at the 44 Avenue NE crossing.
Additionally, on Sunday, the northbound tracks at Victoria Park/Stampede Station will be closed for maintenance from 5 a.m. to 10 p.m., with all trains running on the southbound tracks.
More information can be found online.