It looks fake. How can something so massive react this way?
It has do with not having the vent caps open when cleaning. I found this statement from a railroad community site:
According to them, when they steam clean a tank car, they have to keep the valves open. They closed them, steam condensed, created a vacuum, and WHALLA!! Instant scrap metal.
Most of the time, it is done to old tank cars for demo purposes on the importance of tank car safety,