The mention of "beloved Clara" also doesn't ring any bells with Doc.
Mayor Hubert stops by and reminds Doc that he agreed at last week's town meeting to pick up the new school teacher.
They've just received word that she's coming in tomorrow morning.
As an afterthought, the mayor offhandedly tells Doc the teacher's name is Clara Clayton.
Marty and Doc now know who will erect the tombstone in his memory.
Doc then decides that to avoid getting into any kind of time-altering love affair, he will simply not pick up Clara from the train depot the next day and decides that they should get the DeLorean Marty came back in, and go.
However, when Marty explains that the fuel line is ruptured, Doc's eyes go wide.
Marty explains that as long as they have the Mr Fusion generator, they should be able to get back.
It is then that Doc explains the flaw in Marty's thinking: Mr Fusion powers the time circuits and the flux capacitor, but the car still needs gasoline to run...gasoline that will not appear until the 20th century.
Doc and Marty then recover the DeLorean, and try everything from a team of horses pulling the vehicle, to using an incredibly strong alcoholic drink.
The horses cannot pull the DeLorean above 24mph, and the alcoholic drink ends up destroying the fuel-injection manifold on the car.
Realizing that the DeLorean can't run under it's own power, and they can't pull it, Doc figures they will need to push it up to 88 mph.
Hearing the whistle of the train pulling into the station, he surmises a possible solution.
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