 The route continues north, paralleling the elevated Northeast Corridor tracks that lead up to Newark Penn Station, which serves Amtrak and NJ Transit trains.At the Emmet Street intersection, Route 21 becomes a four-lane, undivided road and intersects Murray Street, which provides access to the Ironbound neighborhood of Newark.This section of Route 21 through the southern part of Newark has a high accident rate due to the heavy concentration of businesses and traffic lights along this portion of road.