We know it won't run under its own power. We know we can't pull it. But if we could figure out a way to push it up to 88 miles an hour. Huh?

— Dr. Emmett Brown (Christopher Lloyd)

12 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 00:40:23.471 in the DVD version of the movie.

Quote context

[...]

- I wish... Wait. I've got it! We can simply roll it down a steep hill!

- Oh! We'd never find a smooth enough surface. Unless... Of course! Ice!

- We'll wait until winter when the lake freezes over.

- Winter? Doc, what are you talking about?

- Monday! It's three days away!

- All right, all right, all right. Just let's think this thing through logically.

- We know it won't run under its own power. We know we can't pull it. But if we could figure out a way to push it up to 88 miles an hour. Huh?

(STEAM TRAIN PASSING IN THE DISTANCE)

- That's it.

- How fast can she go? Why, I've had her up to 55 myself.

- I heard that Fearless Frank Fargo got one of these up to near 70 out past Verde Junction.

[...]