Whats-frying-the-electrical-systems-on BART trains?

http://spectrum.ieee.org/view-from-the-valley/transportation/mass-transit/whats-frying-the-electrical-systems-on-bart-trains

http://spectrum.ieee.org/nanoclast/semiconductors/devices/nanoparticles-do-the-job-of-semiconductors-in-novel-electronic-circuits