Marty: Every kid in school knows that story because we all have teachers we'd like to see fall into the ravine.
Doc: Great Scott!
Doc stops his horse.
Doc: (continued) Then she was supposed to go over in that wagon...and now, I may have seriously altered history.
Marty: Look, Doc, what's the worst that could happen, huh? So they don't name the ravine after her. Let's just get the DeLorean ready and get the hell out of here.
Doc ignores Marty and speaks to himself.
Doc: I wish I'd never invented that infernal time machine - which caused nothing but disaster.
Doc rides slowly away. Marty looks at Doc for a second in a "what's going on?" look and then follows him.
SEPTEMBER 5, 1885
Cut to the blacksmith shop, the next day. Doc and Marty are working on the DeLorean on opposite ends of the room. Doc is working on the tyres. They speak to each other through walkie-talkies, this will be denoted by (w.t).
Marty: (w.t) Doc, Doc, this is Marty. Can you read me? Over.
Doc: (w.t) Check, Marty.
Marty: (w.t) Great Doc, these things still work.
Doc: All right.
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Both Doc and Marty moves towards a model railroad that Doc has built. There is a train, various named locations and a small model DeLorean marked "Time Machine".
Doc: Marty, once more, let's go over the entire plan and layout. I apologise for the crudity of this model...
Marty remembers the conversation he and Doc had in 1955 in Doc's lab when Doc showed Marty the model of the town square.
Marty: Yeah, I know, Doc, it's not to scale. It's OK, Doc.
Doc: All right. Tomorrow night, Sunday, we'll load the DeLorean on to the tracks here on the spur right by the old abandoned silver mine. The switch track is where the spur runs off the main line 3 miles into Clayton...(correcting himself) Shonash Ravine. The train leaves the station at 8:00 Monday morning. We'll stop it here, uncouple the cars from the tender, throw the switch-track, and hijack - (he smirks here as he "corrects" himself again) borrow the locomotive and use it to push the time machine. According to my calculations we'll hit 88 miles per hour just before we hit the edge of the ravine, at which point we'll instantaneously arrive in 1985 and coast safely across the completed bridge.
Marty spots a sign near the model windmill. It says "Point Of No Return."
Marty: What does this mean? "Point of no return"?
Doc: That's: our failsafe point. Up until that point we can stop the locomotive before it plunges over the ravine. But once we pass that windmill, it's the future or bust.
A few minutes later, Doc is sorting out the electricity to work the model.
Doc: Here you go, Marty. Connect that to the positive terminal. All right, Marty, you all set?
Marty: Yeah, yeah, go.
During the following, Doc says his lines as if he is singing them slightly. He also pushes the switch down more to get the train's speed up.
Doc: Train pulling out of the station! Coming up the switch track! Stop at switch track! Throw switch! Pull up the DeLorean! Pushing the DeLorean up to 88 miles per hour!
Both model DeLorean and train fall off the table once they hit the "ravine". The car is caught by Doc, the train lands onto a pillow placed underneath.
Doc: It couldn't be simpler!