The New york Central built (in the early 1930s) a massive structure to eliminate the 10th Avenue line that ran at grade level. The prototype averaged 29' elevation to the rail head. It average 30' wide to 80' wide and was capable of supporting 4 freight trains at the same time on it double track main. The High Line or the Elevated Portion of the 30th Street Branch
The High Line ran from 34th Street to to St. Johns Park Freight Terminal.