A gas leak near Enfield has disrupted the London-Stansted Airport rail link.
The leak from a medium pressure gas main was detected at 3am (16 August) 18m from the railway line, close to Brimsdown station.
The London Fire Brigade sent two vehicles to attend the leak while engineers from the National Grid turned off the local electricity supply to reduce the risk from igniting the gas.
Services to Stansted Airport, Hertford East and Stratford, to Bishop Stortford, to Broxborne and to Cambridge and Kings Lynn via Seven Sisters were all disrupted.
As a precaution Brimsdown level crossing was closed.
Repair work was completed at 2pm (16 August), and the line reopened.