Doc and Marty escort her to her new house adjacent to the town's schoolhouse.
Doc explains to Clara that he'll clear up the issues with the owner of the buckboard rental business in town, and tells Clara that he also has a shop.
However, he falters by first saying he's a scientist, which piques Clara's interest.
Marty eventually tells Doc they have to be going, and they head off.
As they go a ways off, Doc makes mention how 'Ms Clayton almost ended up at the bottom of Clayton Ravine.'
It is then that Marty remembers the history of the ravine that was taught to him in school: Clayton Ravine was named after a school teacher who fell in there 100 years ago (meaning 1885).
Doc now realizes that they have changed history in some way, and curses inventing the time machine, feeling it has now continued to ruin things.
The next day, Doc has finished outfitting the DeLorean with standard gauge track wheels, and shows Marty a scale miniature of his plan for getting them back.
Tomorrow they will load the DeLorean onto the tracks along the stretch near an abandoned silver mine.
When the 8am train leaves the station on Monday morning, theyll stop it at the switch track, uncouple the extra cars and then ask to 'borrow' the locomotive, and use it to push the time machine.
Doc calculates that they'll get the engine to 88mph, time travel back to 1985, and coast across the completed bridge.
Marty notices a windmill marked as their "Point of no return."
Doc explains this is the fail-safe point.
At this point, they can still stop the train before it hits the ravine, but once they pass the windmill, there's no turning back.
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