OC Transpo says service on O-Train Line 4 to the airport has resumed after another staffing shortage halted trains for several hours on Saturday. The Route 105 airport bus was still running to serve passengers between stations. Service was restored before 4 p.m. Last month, a shortage of controllers caused Lines 1 and 4 to close. Lines 2 and 4 were also closed last weekend for maintenance. OC Transpo recently announced summer service changes, which begin on June 28 and will adjust service on Line 4 from running every 12 minutes to every 24 minutes. It says the changes are meant to stabilize service for customers.
