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On the NEC Amtrak says 90F air temp, but it actually uses rail temperature gauges to drive the actual speed limit enforced as a TSR by ACSES so it can be quite dynamic. The parameters used are not published AFAIK.It isn't the air temp that's important. It is the temperature that the object is heated to. For instance, the air temp can be around 85 to 90, but on an astroturf field, the surface temperature can be closer to 170 to 175. I don't know what railroad tracks heat like. You've got a long string of metal, which leads me to believe that it doesn't take a significant amount of heat to cause trouble. Amtrak's own heat restriction temperature is 90 degrees. It isn't like CSX is outrageously different.