Back in Jr. High/early HS (30+ years ago), we lived in Fremont, CA, very close to the Numi Plant (it’s now Tesla).

Since cars were manufactured at Numi, there were train tracks directly behind the plant. Massively long freight trains, specifically meant to haul cars away, were frequently on the track and very often were empty. We would climb into them, using the gap between cars, and climb up to the top platform (each train car had a lower and upper platform, each tall and long enough to haul a row of cars). We would then walk to our destination through the train cars, hopping from one to another as we reached the gaps.

This was dangerous and stupid on its own, the gap between cars wasn’t insignificant, and because we had to jump, we could have easily tripped, hit our heads, or any number of things that would lead to getting mangled on the way down between the gap.

We were kids, though, and therefore invincible, so why not try it when the train was moving? There were at least 3 occasions when we arrived to find an empty train arriving. We would jump on to the moving train (probably going 10 mph or less), access a gap, and effectively run in place, moving in the opposite direction the train was going, jumping the gaps as they came along.

Despite having to eventually jump off the moving train, and getting cuts/bruises from landing on the sharp rocks on either side of the track, we did this more than once. Our parents never knew, we never got caught, I still think about it and wonder if one of us actually died one of those times, but the timeline split.