Some are. Retrofitting infrastructure necessary to facilitate reliable, safe autonomy in all conditions is expensive and building systems to meet expectations i

Some are. Retrofitting infrastructure necessary to facilitate reliable, safe autonomy in all conditions is expensive and building systems to meet expectations in all conditions is also. Many railways grapple with issues of reliability and accuracy despite being partially or fully automatic. With cars, you have the easy out that the responsibility always rests on the driver. If you mess up, it's their fault; their hands should always have been on the wheel. If you break it, one person is late for work. If you break a rail network, everyone is late for work. Different risk profiles. Being able to ship code of dubious quality and iterate on it is preferred for companies rather than engaging in a massive contract to deliver a perfectly working rail inventory and routing management system.