Regular service resumes on TTC's Line 1 after signal problems

The TTC says regular service has resumed on Line 1 after signal problems caused a brief shutdown and delays between Finch and Queen's Park stations Tuesday morning.

Interim TTC CEO Greg Percy said a zone controller, which tracks where trains are located, went down around 5:40 a.m on Tuesday and was back up around 6 a.m. 

Service was down between Finch and Queen's Park stations for around half an hour until 6:15 a.m. 

But delays up to 15 minutes continued Tuesday morning because trains had to be "re-established on the zone controller," Percy said during an interview with CBC Radio's Metro Morning. 

The TTC did a root cause analysis on persistent signal issues that caused a string of delays in early December, Percy said. 

"We thought we had it fixed," he said. "We don't know if it's the same problem or not, and we don't know if it's weather related or not at this stage."

Percy said Toronto has seen a "highly unusual" stretch of subzero temperatures, following back-to-back winter storms that walloped the city with more than 50 cm of snow starting Feb. 12. 

"When you combine that much snow with extreme cold temperatures, that's when things start to break," he said.