All three incidents took place on trackage not owned by Amtrak. Amtrak has one grade crossing on the NEC and a handful on the Amtrak/MDOT-owned Michigan line from Porter, IN to Dearborn, MI.
Railroad crossing safety improvements are mainly funded by the federal government's Section 130 program, although the freight railroads also spend millions each year protecting their grade crossings. In FY22, $245m of dedicated funded from the federal government was set aside to be given to states for grade crossing upgrades.
The derailment of the Southwest Chief in Missouri is a particularly troubling case. That grade crossing in particular was highlighted by the state of Missouri in a report published earlier this year in need of $400,000 worth of improvements in order to be made safe (SOURCE). Additionally, the grade crossing sat at the top of a steep hill, often causing the trucks that used the crossing to stall out.
Although it is the responsibility of the state and local government to maintain railroad crossings, there are certainly steps railroads can take to increase safety at grade crossings. Again looking at the Southwest Chief derailment, the local farmers that used the road petitioned the owner of the tracks, BNSF, to trim foliage along the right of way to allow for better lines of sight. Without being able to see the tracks due to the overgrowth, and the lack of crossing gates, many drivers were crossing the tracks blindly (SOURCE).
