Congress is preparing to mandate more hot bearing detectors across the national freight rail network, at an estimated cost of $1.1 to $2.2 billion, as part of the Railway Safety Act. The case is safety. The reality is more complicated.
Hot bearing detectors and track geometry inspection systems are not the same thing. They do not detect the same failure modes, and they do not address the same risk categories. Bearing failures cause approximately 5.9 percent of freight rail derailments. Track geometry defects cause them at roughly four times that rate. Conflating the two produces policy that is expensive, imprecise, and targeted at the smaller problem while the larger one continues to be addressed through the industry’s own capital investment.
East Palestine was not a failure of detector coverage. It was a failure of what happened after detection. No additional detector prevents that.