Grand Central Terminal has plenty of secrets, though most of them aren’t quite secret, as they have been covered in the media in some shape or form. If you’re lucky enough to ever get on a VIP tour of the Terminal, there is one place that tour most likely will never go – the Williamson Library. That’s right – hidden within the walls of Grand Central Terminal, since 1937, is a library! It certainly isn’t flashy – and probably not tremendously interesting to anyone that isn’t a railfan – but one of the library’s prized possessions makes this one of...