sentences:  Fortunately for the railroad, the first 8 miles to Pottersville was almost entirely flat and posed no significant engineering challenges.The next extension, from Pottersville north to Peapack, New Jersey, however, would be different.This section would feature an "L"-shaped climb up a 2%-3.5% grade, with a 4% drop on the other side of the hill, and a , wooden trestle, the only significant structure on the mainline of the railroad.