Opposite View. The CSX (former Baltimore & Ohio Railroad) crossing at 6-Main in Darby, Pennsylvania is usually a morning run-by photo stop on a Wilmington NRHS Superbowl Trip, but on Saturday, February 12, 2022, it was an afternoon stop for the group. This location is unusual but not unique - there are a total of 4 locations in the United States where trolley cars cross a railroad at grade.