Fear of trains fear about rail travel was heightened after British surgeon John Eric Erichsen described a post-traumatic diagnosis known as railway spine or "Erichsen's disease". People diagnosed with this had no obvious injury and were rejected as fake. Nowadays it is known that traffic accidents may cause posttraumatic stress disorder. It has been variously called as "train phobia", "railroad phobia", "dread of railway travel", etc. The German term "Eisenbahnangst" used, e.g., by Sigmund Freud was literally converted into Greek as "siderodromophobia" (Eisen = sideron = iron, Bahn = dromos = way, Angst = phobos = fear). In cases when this anxiety exceeds
Realm of Fear in the matter stream based on their equivalent numbers, and soon they rescue the remaining crew. The "Enterprise" crew determine that an explosion near the "Yosemite" during the transport caused the people to become trapped. Later, Barclay and O'Brien meet at Ten-Forward to discuss the nature of fear, upon which O'Brien shows Barclay his pet spider Christina to share with a visibly frightened Barclay. Realm of Fear "Realm of Fear" is the 128th episode of the American science fiction television series "". It is the second episode of the . "Realm of Fear" primarily focuses on Reginald Barclay's paralyzing fear