We see the DeLorean. In the background the train appears and stops just before it would hit the DeLorean. Marty and Doc grab coloured logs and put them in the fire.
Marty: What are these things, anyway?
Doc: My own version of Presto Logs. Compressed wood with anthracite dust chemically treated to make the fire burn hotter and longer. I use them in my forge. These three will light the fire sequentially, make the fire burn hotter, kick up the boiler pressure and make the train go faster.
Meanwhile Clara sees the coaches by themselves on the track, and guesses that Doc has the locomotive. She gestures to her horse to move.
Clara: Hiyah!
Marty is in the DeLorean. Doc is in the train. Doc blows the whistle and the train starts to move. It bumps into the DeLorean, which also starts to move. Marty and Doc speak to each other through walkie-talkies, as before this will be denoted by (w.t).
Marty: (w.t) Ready to roll!
Clara can now see the train, but Marty and Doc can't see her.
Clara: Emmett!
Cut to Marty in the train.
Doc: (w.t) Marty. are the time circuits on?
Marty turns them on.
Marty: (w.t) Check, Doc.
Doc: (w.t) Input the destination time - October 27th 1985, 11am.
Marty does so, then checks the speed.
Marty: (w.t) We're cruising at a steady 25 miles an hour, Doc.
Doc: (w.t) I'm throwing in the Presto Logs.
One by one, Doc throws them in.
Doc: (w.t) Marty, the new gauge will show the boiler temperature. The colour coding indicates when each log will fire. Green, yellow, and red. Each detonation will be accompanied by a sudden burst of acceleration. Hopefully we'll get up to 88 miles per hour before the needle hits two thousand.
Marty: (w.t) Right, what happens what it hits two thousand?
Doc: (w.t) The whole motor will explode.
Marty: (w.t) Perfect.
Clara has caught up with the end of the train and manages to climb on. Cut to Marty.
Marty: (w.t): Hey, Doc, we just hit 35!
Doc: (w.t) OK, Marty, I'm coming aboard!
Doc climbs over the front of the train.
Clara: Emmett!
But Doc doesn't hear her. Cut back to Marty. He's looking at the speedometer.
Marty: Come on, come on. (screams into w.t). You better hold on to something, Doc, the yellow log's about to blow!!!
There is an explosion. Clara is thrown back a little bit and is stunned.