After last week’s Metropocalypse, we all took in the reports as to how major loss of service happens, and the fallout after the fact. But nothing really hit the nail on the head like Lena H. Sun’s half-report, half-plea for the future. Sun touches on most of the points that seem (at least to us) to be regurgitated over and over these days: Metro’s infrastructure is old – trains are past their primes, overworked stud…