Passengers face disruption on the London Underground and the railway line between Liverpool Street and Stansted Airport.
The morning rush hour is off to a sticky start after delays across the Piccadilly, Northern and Victoria lines.
The Northern line has minor delays between High Barnet and Camden Town southbound only due to a shortage of trains, while the entire Victoria line is affected by train cancellations.
Meanwhile, the Piccadilly line has minor delays due to a shortage of trains, while the stretch between Rayners Lane and Uxbridge remains suspended.
Elsewhere, Stansted Express and Greater Anglia have issued a ‘do not travel’ warning between Cheshunt and Broxbourne. All lines are blocked because of a fault with the signalling system which is causing up to 60-minute delays on the route.
