PHMSA and DOT issued a joint safety advisory in the wake of the July 6, 2013 derailment and explosion of an unattended train carrying crude oil tanker cars in the town of Lac-Mégantic, Quebec, which resulted in 47 fatalities.  The advisory contains two recommendations relating to PHMSA’s Hazardous Materials Regulations (49 CFR Parts 171-180; HMR):…