Outside of town in the countryside, Marty, Ally, and Doc raced on their horses to catch up to the train. They managed to catch up with it while it was still moving on the track.

Doc reached for the ladder of the caboose and pulled himself on board. He pulls Marty on. Marty pulls Ally on, leaving their horses behind.

They climbed over each car, following Doc closely. When they make it to the 2nd car from the locomotive, Doc turns to the siblings. "Masks on, you two," he said.

Marty and Ally cover their noses and mouths with their bandanna along with Doc. They jump in the locomotive.

"Freeze!" He said, aiming his gun at the conductor. "Is this a hold up?" the conductor asked, holding his hands up. Doc looks at Marty and Ally for a moment and said, "It's a science experiment! Stop at the switch track up ahead!"

The conductor did as he was told and they stopped at the switch track. Just before the train stopped completely, Marty jumped out and ran to the switch. After a moment, he switches the track. "Doc!" He called, holding out a thumb.

"Uncouple the cars from the tender," Doc instructed. The conductor does what he's told. Doc starts the locomotive back up again. As it moved, Marty hopped back in the engine with the help of Ally.

Doc sat in the conductor's seat and pulled on the whistle. "I've always wanted to do that!" He said with a smile. "So have we!" Marty laughed. Ally stuck her head out of the window and called, "It's so fun!"

About ten minutes later. they arrive back at the Delorean. Doc stops the locomotive before it connects with the Delorean. They all hop out of the locomotive and walk to the car. Marty opened the Delorean passenger side door and pulls out three color-coded logs.

"Doc, what're these anyway?" He asked. "My own version of Presto Logs. Compressed wood with anthracite dust chemically treated to make the fire hotter and last longer. These three will light the fire sequentially, make it burn hotter, kicking up the boiler pressure and make the train go faster," he explained, "Quick, you two get in,"

The siblings do as they were asked. Marty sits in the driver's seat while Ally takes the passenger seat. Doc hops in the train, making it roll a little until it connects to the Delorean, making the siblings jolt forward a bit. They are now rolling down the track.

"Marty, Ally, are the time circuits on?" Doc asks through Ally's walkie-talkie. Ally leaned forward and flips the time circuits on. "Check Doc," she replied.

"Input the destination time to October 27, 1985 at 10:59 am," Doc instructed. Marty leaned forward and punched in the date on the keypad and reported, "Check, Doc. We're now crusing at a steady 25 mph,"

"Okay, I'm gonna put the logs in!" Doc says, throwing the Presto Logs in the fire before speaking in the walkie-talkie again, "Marty, Ally, the gauge will show the boiler temperature. Inside the Delorean, each detonation will be accompanied by a sudden burst of acceleration. Hopefully, we'll get up to 88 mph before the needle reaches 2,000,""How come, Doc?" Ally asked curiously. "Yeah, what happens then?" Marty added. "The entire boiler explodes," Doc explained.

Marty muttered under his breath, "Perfect," "Man, why is time traveling so risky yet so much fun?" Ally joked. Marty shot her a look before looking back at the speedometer, " Hey, Doc, we just hit 35!"

"Okay, Marty and Ally, I'm coming aboard!" Doc said, hanging the walkie-talkie up. He began to climb to the front of the locomotive, where the Delorean was connected.

Unbeknownst to them, they had been followed the whole time. None other than Clara; she figured out that Doc was telling the truth and she made her way to the train.

Ally looks around the speedometer gauge and yelled, "Doc, hang onto something! The yellow log is about to blow!" There was a gigantic explosion from the train, causing the locomotive to speed up, making the Delorean roll faster on the track.

Ally opened her gull-wing door, sticking her head out while the Delorean was speeding up. Marty leans over her so they both looked openly at Doc for the first time.

"Doc, we just hit 45, go for it!" Marty shouted in the walkie-talkie. Ally looks at the speedometer and muttered, "Fifty,"

"Thirty-eight to go," Marty said.

Suddenly, the train whistle blared just before Doc could climb in. Marty and Ally glance at each other with puzzled looks on their faces. "Um... Marty, that's not Doc doing that," Ally said.

"Doc, what's going on?" Marty asked. "It's Clara! She's on the train!" Doc said into the walkie-talkie. The siblings sit back in the Delorean in disbelief. "Clara, perfect," Marty muttered. "Maybe we were right after all," Ally added.

"I'm going back for her! She's in the cab! Keep reading the speed!" Doc announced. The Delorean whizzed by the windmill. "Doc, we just passed the windmill! We're going passed 60!" Ally yelled, her hair blowing in the wind.

"Then, we'll take her back with us!" Doc replied. Ally and Marty hoped that Doc would make it back. He was coaxing Clara to climb over to him, but she was too afraid.

Ally checked the speedometer again and yelled, "SEVENTY!" Marty looked at the pressure gauge and his eyes widened. "DOC, THE RED LOG'S ABOUT TO BLOOOOW!!!" he screamed.

Then, there was a massive explosion; the boiler exploded just as Doc said. Clara almost falls off the train along with Doc. Clara's purple dress gets caught on the train. The Delorean was going so fast that it did a wheelie for a few seconds before dropping back onto the tracks.

"Doc, hang on!" The siblings yell, worried for their friend/mentor. They looked around for something they could use.

Then, the hoverboard floats up front, catching their attention. "Marty, the hoverboard!" Ally said in excitement. "Yeah! Let's pass it to him!" Marty agreed, grabbing the hoverboard.

Sticking their heads out, Marty yells out, "Doc, we're gonna slip you the hoverboard!" "Marty, Ally, watch out!" Doc shouted. Marty and Ally turn their heads to look to their left just in time to see a wooden sign that says the bridge isn't complete yet.

"Aaah!!!" they both screamed as they ducked back in the Delorean. The car crashes into the sign, shattering it. "Aaah!" Marty shouted. "Geez!" Ally shouted.

When it was safe, they stick the hoverboard out of the door. "Doc catch!" Ally said, letting the hoverboard go. Doc manages to catch it easily, putting hid feet on it. "Yes!" they say in unison.

Doc catches her and they both ride off, staring into each other's eyes. Marty and Ally look on in horror but there isn't anything they can do now. "Ally, shut the door!" Marty shouted.

Ally does what she's told and slams the gull-wing door shut and they prepare for temporal displacement. They look at the time circuits before each other.

Then, the Delorean vanished into thin air with the siblings, letting the train fall off the ravine, exploding into nothing when it hits the bottom.