Purpose-Built Autonomous Train Control (GoA2–GoA4) Is Commercially Proven
#1GoA4 (fully driverless) train operation is the global commercial standard for new metro and industrial rail builds, and GoA2/3 operation has been in continuous heavy-freight production since 2019. Rio Tinto's AutoHaul — the world's largest autonomous heavy-haul rail network — has logged over 3 million km of autonomous operation on 53 locomotives, hauling iron ore across the Pilbara with zero engineer in the cab. Wabtec's Trip Optimizer and LEADER systems, already installed on the majority of Class I locomotives in the US, function as partial GoA2 systems that physically operate throttle and braking controls during normal running. The technology risk is resolved — this is mature, revenue-generating, commercially deployed infrastructure.