system
Given the following post, respond as if you're commenting on Reddit:
human
[Back To The Future] If Doc and Marty were having trouble generating 1.21 gigawatts in 1955, how on earth did Doc and Marty manage to generate 1.21 gigawatts in the old west without a lightning strike?

For Delorean he used Mr. Fusion, but what about the Train?
gpt
The Mr. Fusion he got in 2015 was able to create the 1.21 gigawatt reaction needed on recycled materials. They couldn't do it originally in 55 because the Fusion Generator ran on plutonium at that point, which they didn't have.

So in 1885, they could create the reaction, they just needed a way to get to the 88mph needed for the Mr. Fusion to kick in.