A section of the Yonge-University-Spadina subway line could temporarily close next year as the Toronto Transit Commission mulls over plans to upgrade the aging track bed between Eglinton and St. Clair stations.

The TTC hasn’t confirmed a timeline for the possible service disruption, but says the shutdown may happen sometime next summer.

"We don’t know how long we’re going to need to (close a portion of the Yonge subway line)," TTC spokesperson Brad Ross told CTV Toronto on Friday.

"These are the kinds of questions we are asking ourselves in terms of what is the timeline going to be, what kind of work is it we can do in short order."

Much of the 60-year-old track bed between Eglinton and St. Clair stations is exposed and hasn't been replaced since the subway opened .

Trains pulling into the two stations are currently on speed restrictions due to the age of the tracks. The TTC says once the work on that portion of the subway line is complete, subway trains can return to regular speeds.

The transit agency says it is considering a number of plans to help commuters get around during the possible closure, including running shuttle busses between Eglinton and St. Clair stations.

The TTC says it will release more information on the possible closure in November.

With a report from CTV Toronto's Natalie Johnson