Here. This spur that runs off the main line three miles out to Clayton Ravine. It's a long stretch of level track that will still exist in 1985. This is where we'll push the DeLorean with the locomotive.
11 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:41:25.436 in the DVD version of the movie.
Quote context
[...]
- Oh, it's just a little bet he and I have, that's all.
- Theoretically speaking, could it be done?
- Tell me, when does the next train come through here?
- Right, Doc, but according to this map, there is no bridge.
- Well, Doc, we can scratch that idea.
- I mean, we can't wait a year and a half, for this thing to get finished.
[...]