Trinity Metro and DART warn TRE trains will be operating at reduced speeds Monday afternoon due to excessive heat.
In the past, the TRE said when temperatures climb above 100 degrees trains are kept below 65 mph, which is up to 20 mph slower than normal.
Riders are warned to expect delays of 10-20 minutes during the afternoon.
Get DFW local news, weather forecasts and entertainment stories to your inbox. Sign up for NBC DFW newsletters.