The operator of a CTA Yellow Line train that slammed into a snowplow on the tracks last November, injuring some two dozen people, had alcohol in his system after the crash, a recent federal report found. A hospital blood test around 11:20 a.m., about an hour after the crash, showed the operator had ethanol in his system at a level of 0.06 grams per deciliter of blood, according to a National Transportation Safety Board medical report made public in August.