Question: For Doc to be so worried about corrupting the timeline in this movie (especially when it comes to falling in love with Clara) he surely doesn't seem to think twice about destroying the locomotive that will no doubt have a huge effect on the timeline. I doubt there were many trains on that railroad, with that mode of transportation now gone, Hill Valley itself could be wiped out.
Captain Defenestrator
13th Dec 2012
Back to the Future Part III (1990)
Answer: Corrupting time was a worry for Doc, however, he also recognized that it was at least partially unavoidable. Otherwise, Doc would never even be able to go buy food, because how would he know that the meal he ordered wasn't one that someone else was meant to choke on? Occupational hazard of time travel.
Chosen answer: In the timeline that the original Marty and Doc came from, Hill Valley exists so that town obviously survived that incident. An accident already occurred on that day in their history. They just didn't know it was them that caused it.
That is not how time travel works in these movies. In fact, the entire series revolves around the timeline being changed whenever they travel into the past. There are no stable time loops. The train was not destroyed in the original time line.
It's tough to say whether or not the train wasn't destroyed in the original timeline. Maybe by some lucky chance the train would suffer an accident similar to that anyways maybe just a bit earlier. There's really no indication either way. It's also possible they build another train or had others in service. I doubt they didn't have some backup plan in case the train was out of commission for a long period of time or destroyed.
22nd Nov 2012
Back to the Future Part III (1990)
Question: Heres something that never made sense to me. I could see how Marty's great-great-grandfather Shemus could resemble Marty (so Michael J. Fox plays him), but why would his great-great-grandmother Maggie McFly resemble his mother when this is his father's side of the family?
Chosen answer: This has been covered before. Men tend to be attracted to women who remind them of their mothers, so the McFly men would be attracted to a certain "type" throughout the years until we get to George meeting Lorraine.
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Answer: Doc must have reasoned that the loss of the locomotive would have a minor impact on Hill Valley, if at all. The railroad company would likely have replaced the destroyed locomotive. Obviously Doc was correct as there seems to have been no impact on Hill Valley's economy whatsoever and the train lines continue to run into the 1980's.
BaconIsMyBFF