This "digital extra" provides a unique glimpse into life on BART before and after the COVID-19 outbreak. The NBC Bay Area Investigative Unit spent months recording on BART trains, interviewing passengers, questioning top BART officials, and analyzing thousands of crime records to explore how a world-class transportation system got derailed. View the complete series at: http://www.nbcbayarea.com/derailed Stay connected: Follow us on Twitter: http://www.twitter.com/nbcbayarea Like us on Facebook: http://www.facebook.com/nbcbayarea Follow us on Instagram: http://www.instagram.com/nbcbayarea Add us on Snapchat @NBCBayArea Catch up on all the day's news: http://www.nbcbayarea.com/ Download our app: On iOS: http://nbcbay.com/R1BhqYM On Android: http://nbcbay.com/rUcA97h #WeInvestigate #BART