The River LINE operator who died in a crash Monday was a 41-year-old single mother of three, according to an attorney preparing to sue NJ Transit on her family's behalf. And the cause of the fatal accident — a fallen tree on the tracks — was a known hazard in the crash area, the lawyer says.

The operator "lost her life due to the failure of the responsible parties to inspect these tracks and keep them clear," said the attorney for the family.

MANSFIELD TWP., New Jersey (WPVI) -- River Line service on New Jersey Transit, between the Florence and Trenton stations, is still suspended after Monday's deadly train crash. The train slammed into a tree in Mansfield Township, Burlington County, killing the operator and injuring 23 passengers