The Time Train
Hey guys, I was just wondering if it puzzled you as much as it does me that Doc stayed with Clara in 1885, but somehow managed to find the resources to build a time travelling train..lol. When it took him years to build the Delorean. I'm sure there are many possibilites but I was just curious what you all thought. 
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He's got his notebook with exact details on how the flux capacitor works and he's proven he can produce the necessary power with a train to make the jump. He clearly fluxxed up a train engine then made a jump the future to quickly and easily get it fully refined with hover jets etc.
And as we also see in 3 given the instructions of HOW microchips are built the 1955 doc was easily able to make a larger make-shift microchip using 1955 materials; so why culdnt doc make an even bigger scale microchip using forging available at that time, especially since tht doc is the one from 1985 who has experienced microchips first hand.
He couldn't have - the effects of tinkering with it would be catastrophic! He did still have the broken one to look at, though. My guess is that he used the broken DeLorean for reference when needed and made precautions to make sure that it would be there for Marty to use in 1955.
This is hardly relevant to the topic but I noticed that your birthday was three days ago, based on your DeviantArt page. Happy Belated Birthday!
But on a side note, using the technology he had with him, like Jennifer mentioned, he could easily use the parts and speed up the construction process.
I forgot about the broken DeLorean. Using that for reference would really be helpful, especially if the Mr. Fusion isn't a Doc Brown invention.
The only reason I thought he could repair the Delorean was because I thought maybe he could gotten working parts from the Delorean Marty brought back. But that's a big maybe.
Why would he though? At the time the plan is to go back to the future with marty, he only gets left behind due to clara.
That's true, that's why it's a big if.
But knowing Doc, I would think he would have kept or used it for something else.
Did they explain that in the movie? Never thought of this before, can't seem to remember it :-)
No they didn't, its just general knowledge.
So to start off...I've never been a fan of the ending of Back to the Future 3. Jennifer needs everything explained....and Doc naming his kids Jules and Verne...I dunno....just kinda felt lame....Anyways.....
How did Doc Brown get out of 1885? I have no problem with him getting a train up to 88 miles an hour. I mean he clearly did it to get the DeLorean back to 1985. But how did Doc Brown create a Flux Capacitor and everything to get a train to time travel? I'm just curious if there is any definitive answer to this.
Now, where he got a power source for it in the 1880s, plutonium or otherwise, I couldn't tell you.
"Marty! It runs on steam!"
Please don't confuse the Younglings.
You gotta think being a Scientist, Doc should i have known all the elements and such where to get them and how to shape them into parts. What i'm saying is maybe he built the parts he used on the train from scratch. there was alot of mining going on in the 1800's I'm sure there would of been plenty of metals he could of used that were leftovers in gold mines and such...Althought this would be extremly tedious work and most defintaly difficult. but what is the flux capicator....Looks like wires in a box to me.
Create a device that generates a temporal field at a speed of 88mph to cross the threshold and bend spacetime and travel to the year 0000 to 'witness the birth of christ'
Debating how doc built a Time machine in the first place in a fictional movie itself is kinda pointless, but as a 10 year old after watching BTTF3 I guessed that Doc used technology from the hoverboard to 'somehow' make a 'basic' working time train.
That said, Doc knew enough about his own invention and about the technology that was available at the time that he could probably adapt it to the technology of the period without too much fuss.