Torontonians can expect another TTC subway closure for the upcoming weekend — and there are plenty more to come as work continues until at least 2020.

A recent Toronto Transit Commission Report listed 10 remaining planned closures for 2014, including two in August.

A minimum of 27 addition closures are planned for 2015, with full day and weekend closures continuing until at least 2020.

“A lot of our infrastructure is aging and this work needs to be completed,” said TTC spokesperson Danny Nicholson, adding that closing sections of the subway during weekends — when there are fewer commuters — significantly speeds up this process.

Subway service normally stops just before 2 a.m. and trains have to be back around 5:30 a.m., leaving only a small window of time for workers.

“If we close down a section of the subway for one Saturday, that’s the equivalent of five weeks of night work,” Nicholson told the Star.

There are around 1.7 million TTC riders each day, making it the third largest transit system in North America, according to TTC statistics.

“The subway infrastructure and the existing system assets, from track to signals, are showing their age under the ever increasing service and ridership demands,” the report stated.

“We are dealing with them and at the same time preparing for the future . . . by investing in essential major improvement projects.”

Projects include new trains, a subway extension, replacing track, and the re-signaling of Line 1 (Yonge-University-Spadina). Shuttle buses operate frequently during the closures, but the TTC acknowledges that the closures “cause significant disruption to customers and increases travel times.”

Nicholson said that while some people complain, many commuters appreciate the increased staff service that accompanies the closures.

“We have TTC staff out whenever we have a closure, directing traffic, directing people to the shuttle buses, answering questions, and directing people to various locations,” he said. “We actually get quite a few compliments as well.”

This weekend, Line 1 (Yonge-University-Spadina) will experience closures between St. Andrew and Union stations Aug. 16-17 while work is done on Union’s second platform. Other upcoming weekend closures include Aug. 23-24 (Bloor to Eglinton), Sept. 6-7 (Bloor to Lawrence), and Oct. 11-13 (St. George to Union and back up to Bloor).