With a forecasted high temperature of 110 degrees and an excessive heat warning issued by the National Weather Service, the hot weather could have an impact on Trinity Metro rail services this afternoon. The most likely scenario would be heat restrictions on speed, which means that TEXRail and Trinity Railway Express would operate at reduced speed of 40 miles per hour, which will generate schedule delays. The anticipated timeframe is 2-6 p.m. Mon 7/18 thru Wed 7/20.