Marty then finds himself back in 1985, as the DeLorean coasts over the completed bridge (now spanning "Eastwood Ravine").
As the DeLorean coasts through a grade crossing, we see the lights flashing and the gates lowered, and motorists looking at Marty oddly.
Just then, a train horn is heard, and Marty sees a diesel engine barreling head-on towards the DeLorean.
With no time to save the car, Marty jumps clear as the engine plows into the time machine, destroying it into numerous pieces. Once the train has passed, Marty looks over the wreckage, and finds the Flux Capacitor and the Time Circuits (both of which give a small flash before falling silent). "Well Doc," says Marty, sadly, "It's destroyed. Just like you wanted."
Returning to the Lyon Estates, Marty is ecstatic that everything is back to normal, including his family and Biff (no longer the tyrant of 1985-A from the second film, but the secretly-bitter auto detailer).
Worried about Jennifer, Marty gets in his Toyota 4x4, and goes to her house to find her still sleeping on the porch like she was when Marty left her in 1985-A. Upon waking up, Jennifer tells Marty that she had a terrible nightmare.
As they drive past the still-in-development Hilldale housing complex, one of Marty's classmates named Needles pulls up next to the two, and challenges Marty to a race. Marty declines at first, until Needles calls him 'Chicken.' However, when the light they are at turns green, Marty throws his vehicle into reverse, not going through with the race.
As he and Jennifer watch, a white Rolls-Royce comes out of a sidestreet, and Needles' truck barely misses it. Marty remarks how he almost hit that car, causing Jennifer to reach into her coat pocket...finding the "YOU'RE FIRED!!!" fax from 2015, with the words slowly fading away (proving that Marty's decision has now changed their future).
The two return to the wreckage of the DeLorean. As they are looking, the grade crossing suddenly activates even though there is no train in sight. Suddenly Marty and Jennifer are blown back as a vintage steam-engine appears with the DeLorean's sonic boom, piloted by Doc. Doc then introduces the two to Clara, as well as their sons: Jules and Verne. Doc then tells Marty that he decided to return to get Einstein, and to let Marty know he was all right. Doc also presents Marty with a framed picture of the two of them, taking at the clock unveiling in 1885.
Jennifer then tells Doc of the fax she had from the future, that is now erased. Doc explains that this simply means their future is theirs to make of it what they will. Doc then prepares to return with his family back in time. "Hey Doc," asks Marty, "Where are you going now? Back to the future?" "Nope," says Doc, with a smile and a wave," already been there!" As Marty and Jennifer watch, The steam engine's wheels fold underneath, turning into a hover train, and it rises into the air, circling around, before reaching 88mph, and flying at the camera.
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