That would make sense if we were talking about something that changes dramatically over time; like a human heart for transplants. Or a nuclear fission core with

That would make sense if we were talking about something that changes dramatically over time; like a human heart for transplants. Or a nuclear fission core without its carbon bars. But trains don’t change significantly in a 10-day period. I doubt they degrade much after a full year, even. They need to be sturdy.