Amtrak, commuter and freight railroads continue to make progress on positive train control (PTC) implementation, but significant work remains to achieve interoperability among the railroads' individual PTC systems, according to a new Government Accountability Office (GAO) report.
As of March 31, 2019, 11 of the 31 host railroads that must have interoperable PTC systems reported that they had achieved interoperability with at least one of their tenant railroads. Collectively, 38 of the 227 unique host-tenant relationships that require interoperability have been completed (17 percent), according to the Federal Railroad Administration (FRA), the report stated.