So, I've been thinking, is the 777 just a number or is there some meaning behind that specific choice of numbers? First thought was it's just a step up from 666, evil in a way, but not so evil it'll actually derail and take a thousand lives with it... retrospective spoiler alert btw. ;)
Today I read some interesting info, apparently 7 is a lucky number. Could this have something to do with it? Imagine the luck in getting that train to stop before the, well, you better watch the movie.
A third option could be that it just sounds good, or maybe it's just a favorite, or it could be completely random... or maybe it has something to do with the triple 7's you usually see in casino slot machines, the one armed bandits, you know? I'm curious.