The hot temperatures are affecting several rail lines throughout the area.
VRE said it has heat restrictions in place on the Fredericksburg Line for Thursday from 1 p.m. to 7 p.m.
Amtrak said it is also implementing heat restrictions on its Northeast corridor lines. On its social media pages, it warns passengers to expect minor delays.
Passengers on Metro rail and bus systems can drink water on trains and buses until Saturday at 3 a.m. because of the severe heat.