The Brief A freight train derailment early Friday blocked all tracks on the Metra BNSF line between Aurora and Route 59, halting service for several hours. A freight train derailment halted service for several hours on the Metra BNSF line in Chicago's west suburbs. What we know:Two freight train cars derailed, blocking all tracks around 5:50 a.m. between the Aurora and Route 59 stations, according to transit officials. Inbound and outbound trains for Metra BNSF were stopped until around 8 a.m. when the tracks were cleared and service was restored. What we don't know:It was not immediately clear what caused the freight train to derail.