Erin, that is a very interesting article, but having been a long time patron of the Titanic Ship of Dreams exhibit (the correct name, mind you) and occasional participant in the tours, I'm surprised I have not heard these stories first hand. In fact, the closest thing I've heard to ghost stories at the TSOD is this tale:
William Barnes once visited the TSOD and stopped at the gift shop at the end of the tour. At the cash register, he was introduced to a psychic. Seizing the opportunity, he said "So you know that I am Thomas Andrews." To which the psychic replied, "No, I don't see his spirit with you, however, I do see his spirit following THAT man..." She pointed to my friend, Mark, who does a wonderful job performing in the tour as Thomas Andrews.
However, since I live just ten minutes away from TSOD, I shall inquire if the ghost stories are genuine and get back to you on that. Had I seen this post sooner, I could have asked them yesterday.
Kyrila