Yes! The technology for rail exists today (and is well proven in Europe and Asia). Self driving cars are largely new and unproven with no clear path to widespread use, with both regulatory and sociatal challenges, in addition to the technical shortcomings that remain.

I would hope that Amtrak in the long term also electrifies the rail network so that the dependency on diesel engines can be reduced - for some routes this may not make sense, but where you have frequent services it seems that it would be a worthwhile impovement too.