TORONTO, Ont. – A downtown portion of the Toronto Transit Commission (TTC) subway’s Line 1 was temporarily shut down on the late evening of March 23 and the morning of the following day, due to the leak of an unknown substance near College Station. The shutdown began at about 11:30 p.m., after the detection of an unidentified liquid – which smelled like gasoline – streaming through an expansion joint just north of the station. TTC press statements referred to the incident as an “environmental spill.” Toronto Water and Enbridge worked with the TTC overnight to detect whether the liquid was flammable. The next morning, 70 shuttle buses operated between nine subway stations as crews from the TTC, Toronto Fire Services and the municipality sought the source of the spill. The workers caulked the station’s expansion joints to stop further leaks and applied an absorbent to the train tracks to solidify the liquid before cleaning and power-washing the area. After sending test trains through the station to ensure that signals and switches were still operational, the TTC reopened the line section at about 1:35 p.m.