An article from yesterday's New York Times (High Line May Mix Pasat with Koons's Vision) details that the noted and sometimes controversial artist Jeff Koons has been in talks with High Line founders Robert Hammond and Joshua David about a $25 million sculpture called simply "the Train" which would highlight the history of the elevated line. The sculpture would be a full-size replica of a 1943 Baldwin 2900 steam locomotive.
Also, according to the website Initiative for a Competitive Inner City the City of New York "invested $115 million on the park, and in return, there has been over $2 billion in private investment surrounding the park. There were 8,000 new construction jobs added which related to the project, as well as 12,000 additional jobs as a result of the area's redevelopment. In many cases, residential and commercial properties around the park have more than doubled sine the High Line's new parks have opened."