The tape can be found at Pylon V-13, next to a microscope on a table at the southern end of the train.
Professor Greebly: People told me my theories weren't possible. They mocked me and called me a "foolish old man." Well, I'm here to tell you that the possibility of time travel is not only real, but that it can be accomplished interdimensionally! I've revolutionized this radical concept, a new way of thinking about skipping across timelines. Instead of using the traditional and often clumsy use of gravity for time travel, I've discovered a way to punch a hole in the fabric of our reality.
By slipping through this fissure in time and space at a high rate of speed, it's my belief that instantaneous time travel will occur. In a few weeks, I will be attempting to slipstream through dimensions using a monorail system as my chariot. If you wish to attend this historic event, I will be at Pylon V-13 of the Appalachian Monorail System. Be there and witness history!