Because of explosive oil-train derailments such as the 2013 accident in Lac-Mégantic, Quebec, that killed 47 people, neighbors of railroads want to know more about the hazards that may be rolling through their communities."In Philadelphia, the tracks go right up against neighborhoods, homes, schools . . . those who would be most affected [by an oil-train explosion] are kept in the dark," said Tracy Carluccio, deputy director of the Delaware Riverkeeper Network, an environmental group based in Bristol.