Disruption is building across several Tube and rail lines hours before the evening rush hour begins.
Passengers are already facing severe delays and suspensions as multiple faults affect services across the network.
Commuters are being urged to check before they travel and allow extra time for their journeys.
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Circle line
The Circle line is heavily disrupted, with no anticlockwise service while engineers fix a points failure at West Ham.
There are severe delays on clockwise services.
District line
The District line is part suspended, with no service between Tower Hill and East Ham due to the points failure at West Ham.
There are severe delays on the rest of the line.
Tickets are being accepted on London Buses, the Elizabeth line and c2c services.
Elizabeth line
There are severe delays across the entire line due to earlier faulty communications equipment.
Hammersmith & City line
The Hammersmith & City line is suspended, with no service running while engineers deal with the points failure at West Ham.
Tickets are being accepted on London Buses and c2c services.
Lioness line
There are severe delays across the entire line due to earlier faulty communications equipment.
Tickets are being accepted on London Underground and London Buses via any reasonable route.
