London’s transport system has been forced to slow down because of the heatwave today.
Tube journeys are expected to be slow and crowded due to the soaring temperatures.
National Rail warned passengers to make only essential journies as steel tracks expand and buckle under stress.
Southeastern Trains, which operates services into London from Kent and East Sussex, said it would run significantly fewer services on Thursday to let trains travel more slowly.
Meanwhile, Greater Anglia said it would run fewer trains from London Liverpool Street to Norfolk, Suffolk and Essex on Thursday and advised customers to check services before travelling
⚠️REMINDER – Disruption into London today as slowdowns in place. Please consider if your journey's essential & check @nationalrailenq
— Network Rail (@networkrail) July 25, 2019