A press release from the United States Government Accountability Office; October 3, 2018:
Forty railroads, including Amtrak, commuter, and freight railroads, are required to implement positive train control (PTC)—a communications-based system designed to slow or stop a train that is not being operated safely. Although the deadline for PTC implementation is December 31, 2018, railroads that meet certain criteria may receive a maximum 2-year extension.
We testified that, as of June 30, 2018, many passenger railroads remain in the early stages of PTC implementation, such as equipment installation and early testing. Most passenger railroads anticipate needing an extension.