It looks like these tracks haven't been touched since the last train rode on the High Line. In reality, everything was removed for the park's constructions. The original tracks were later integrated into the park's design. The overgrown vegetation is meant to look like it did during the time the railway was not used.
Getting to the High Line is easy. A variety of subway and bus options will get you there. Or you could walk. Which entrance should you use? That depends on where you are and what you plan to do. Learn about your options in this post.
The Staten Island Ferry is a great complement or alternative to the Statue of Liberty ferry. It's free to ride and gives you exceptional views of New York Harbor, Staten Island, and the Verrazano Bridge. Ellis Island is visible from a distance.