The TTC has identified the suspected cause of the subway derailment that temporarily shut down service and wreaked havoc on thousands of residents’ morning commutes last Wednesday: a half-inch protrusion on a piece of rail. At a meeting of the TTC board Monday, the agency’s chief infrastructure and engineering officer Fort Monaco said the investigation into the incident is ongoing. But the TTC’s preliminary conclusion is that the culprit was “localized wear” on a piece of track at the agency’s Keele Yard. In an interview, Monaco explained that over time a short section of track at Keele Yard had become misshapen, causing a bulge on the inside of the rail. The TTC has shut Keele Yard while it deals with the problem rail.

Source: thestar January 27, 2020 23:03 UTC