The Philadelphia regionâ¿¿s triple digit temperatures on Tuesday pushed Peco Energy Co. power use just shy of an all-time record and caused afternoon rush-hour delays of up to 40 minutes on SEPTAâ¿¿s regional rail. With temperatures forecast to rise above 100 degrees in the region again Wednesday, SEPTA said the possibility of delays exists once more. â¿¿Pack some patience, particularly in this weather, and just know that we are doing the absolute best to make sure service is getting to them as quickly as possible because we know that no one wants to stand out in this heat,â¿ SEPTA spokesman Gary Fairfax said. â¿¿Customers can anticipate possible delays as they did yesterday. Whenever we are battling heat like this itâ¿¿s always a possibility.â¿ Heat can cause sagging overhead power lines and track buckling on SEPTAâ¿¿s rail system, which officials are looking for and taking precautions to prevent, Fairfax said. SEPTA has also stationed personnel and equipment throughout the service area so they can respond quickly to any problems. â¿¿As it becomes hotter the speed of trains will be reduced to decrease the friction on overhead wires,â¿ Fairfax said. Reducing the maximum speed of trains also reduces the amount of electricity needed to run the trains and SEPTAâ¿¿s overall draw on the regionâ¿¿s power system, Fairfax said. One thing SEPTA riders can do to help, if their schedule permits, is leave work earlier rather than later, Fairway said. Tuesdayâ¿¿s heat resulted in the third-highest demand from Peco customers ever, Peco spokesman Ben Armstrong said. Peco customers used 8,832 megawatts of power on Tuesday, which was just shy of the record of 8,932 megawatts set on Aug. 3, 2006. The second highest demand was 8,884 megawatts on Aug. 1, 2006.