Another fatal train collision to report, this time an Amtrak Northeast Regional that struck and killed a 14-year-old Maryland girl as she was walking to school, the AP is reporting (via WTOP). The accident took place at around 9 a.m. in Baltimore County, but is creating delays all up and down the Northeast corridor as police investigate. AlertDC reported earlier that only one out of four railroad tracks in D.C. and Maryland is currently cleared for service, and at reduced speed at that. Union Station is only now beginning to release northbound trains, and significant delays are likely to continue well into the afternoon.