In a letter sent Wednesday to Amtrak President Joe Boardman, maintenance-of-way and other union officials say employee training is inadequate and demand a change in the policy on "close call" reporting of dangerous incidents.
PHOTOS: Fatal Amtrak train derailment in Delaware County
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They say hazardous conditions exist on the main Northeast Corridor.
In response, Amtrak says it's always working to improve the safety culture. It says the most effective way for that to happen is if management and union leaders work together.
On April 2, an Amtrak train struck a backhoe south of Philadelphia, killing the equipment operator and a supervisor. The National Transportation Safety Board is investigating.