modeltrains
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From Amtrak itself in September,
https://media.amtrak.com/2017/09/amtrak-prepares-diesel-fleet-positive-train-control/PTC-ready locomotives part of Amtrak commitment to safety
WASHINGTON Amtrak plans to equip approximately 310 locomotives to operate using positive train control (PTC) technology and comply with that federal requirement by Dec. 31, 2018.
...
Amtrak has signed an agreement with Rockwell Collins to implement the companys ARINC RailwayNet℠ service, a hosted network, messaging and application platform, designed to meet the PTC requirements mandated by the Rail Safety Improvement Act of 2008, as amended.
This service will allow the Amtrak fleet to interface with the PTC systems of other railroads when using their tracks for our trains. Under the agreement, Rockwell Collins will initialize the Amtrak fleet to run on 19 different railroads, including commuter and freight routes that host Amtrak services."