A 30,000 ton ore train in Brazil will take about that long to stop, due to the nature of that weight strung out over 2.5 miles of distance.
That said, I think an emergency stop (air loss) would stop it faster.
That said, I think an emergency stop (air loss) would stop it faster.
I once learned in a physics class that weight has nothing to do with the stopping distance, but rather the steel on steel friction coefficient.