Under present FRA regulations, not much more than NEC service levels can be done: rolling stock would have to meet guidelines developed for the steam era, curve speeds would be limited, and the signaling would not provide enough capacity for adequate service levels on shared track. This is independent of the incompetence of every FRA-compliant railroad; in fact part of the incompetence is manifested in unwillingness to try to get waivers, even though Caltrain, a small operator, applied for a partial waiver and got it.and:
In contrast, no reform of the FRA is possible short of a complete overhaul. The appropriate passenger rail regulation in the US is that everything that’s legal in Japan or Europe is legal in the US, and the only local task should be a skeletal staff reconciling European and Japanese rules where necessary. A piecemeal approach leads to partial and suboptimal reforms, requiring additional testing of already extensively used trains.Quoted for truth.