The intense summer heat can wreak havoc on train tracks.
Operators are always on alert for what's called a "sun kink," created when the heat causes the rail to shift.
Because of this phenomena, rail inspections increase in the summer, and trains travel more slowly as a precaution.
The Trinity Railway Express, which carries commuters between Fort Worth and Dallas, told News 8 that it monitors both the rail and air temperatures. After it reaches a certain point, trains are restricted from traveling over 60 mph.
On normal days, the TRE can reach speeds of 80 mph.