"Of course, at everyday speed like that of the train, the disparity is small, Martin claims that Scratchy got the light less than a trillionth of a second after itchy - but were the train moving faster, near lightspeed, the time difference would be substantial."
Line 9 was actually half-way through this sentence, but it wouldn't have made sense without the whole thing, not that it makes any without context anyway. This is from a science book. General relativity is being explained with a little help from some Simpson characters.
Brian Greene - The fabric of the cosmos.