(1) Electrify the railroads.
(2) Build new lines in the medians of interstates when possible. Grade separation already exists.
(3) I think 80mph is legally possible for passenger trains with level crossings. In this situation, design the trains to accelerate as fast as possible to 80mph and the signaling system to keep them at max speed.
(4) Or design “lethal” level crossing systems. Go around the gates, you’ll find a spike strip like the “severe tire damage” device in parking lots waiting once you’ve gone through the crossing. If going around level crossing gates costs people a set of tires and a tow, fewer people would do it.
