Today, I close called this frequency on my analog uniden scanner at NY Penn. It was also quite active. It seemed like it was being used for track navigation. It was crowded and many trains were leaving around the same time. My scanner is old and does not have PL function, so I do not know the PL used. The only listing I can find for this frequency is for Amtrak use at the Sunnyside yard. Therefore, unknown why I close called it being used at Penn. Its range was poor though, because I stopped getting a signal as soon as my train departed Penn. Any ideas?