When you said that the inversion was only the second of its kind I guess you meant the interlocking loops? I must've gotten confused, because loops weren't new at that time, considering the first loop was built four years earlier. Also, wouldn't the interlocking loops be two inversions? Even if you meant the batwing, it'd also be two, not one. In other words, would the interlocking loops or batwing just be an element not an inversion? I'm not trying to be a snob, I was just slightly thrown off by your clue. I still would have never guessed Orient Express, but I would've had better chances I guess. Am I at least making sense?