The London Underground is experiencing severe delays this morning due to a number of reported incidents.

Commuters have been affected as several lines have been hit with suspension and delay.

A signal failure at Queensway caused issues on the Central Line, and a further signal failure at Aldgate East is causing disruption on the Circle Line and Hammersmith & City Line.

The Piccadilly Line is affected by an earlier track fault at Northfields.

London Overground services are part suspended due to a signal failure at New Cross.

We will bring you the latest updates and information below.

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Round up

Commuters using the London underground experienced severe delays on several lines this morning due to signal failures and a track fault at Northfields.

The Piccadilly line was the worst affected, and only now TfL is reporting “minor delays” on the line.

The Circle and Hammersmith & City lines were also reporting delays.

Currently the London overground is reporting “severe delays”, with TfL saying:

No service between Surrey Quays and New Cross and SEVERE DELAYS between Highbury & Islington and West Croydon / Crystal Palace / Clapham Junction due to a signal failure at New Cross. London Underground is accepting tickets via reasonable routes.

GOOD SERVICE on other London Overground routes.

The District line is reporting “minor delays”, with TfL saying:

MINOR DELAYS between Upminster and Whitechapel westbound due to a signal failure at Barking.

Piccadilly update

TfL has released an update on the Piccadilly line issues.

Severe delays between Acton Town and Heathrow Airport / Uxbridge and between Arnos Grove and Cockfosters due to an earlier track fault at Northfields.

MINOR DELAYS between Acton Town and Arnos Grove. Tickets accepted on London Buses, South West Trains and Great Northern.

Piccadilly update

TfL is still reporting severe delays on the Piccadilly Line, although the problem is now resolved.

"Use alternative route"

The Piccadilly line is advising commuters to use alternative routes, if possible:

Communication issues

One commuter has questioned the communication of underground staff:

Still issues

The latest advice from those running the Piccadilly Line - the earlier issues are affecting the whole line.

Piccadilly query

There continues to be severe disruption on the Piccadilly line:

Piccadilly line

There remain severe delays on the Piccadilly line, TfL is saying:

Severe delays due to an earlier track fault at Northfields. Tickets accepted on London Buses, South West Trains and Great Northern.

Hammersmith & City line

And there is good news for Hammersmith & City line commuters too, says TfL:

Minor delays due to an earlier signal failure at Aldgate East.

Circle line

Good news for Circle line users, TfL is now reporting only “minor delays”.

Minor delays, clockwise only, due to an earlier signal failure at Aldgate East.

Frustrated commuters

The issues are obviously causing anxiety among many commuters:

Overground confirmation

London overground has confirmed its issues on Twitter:

London overground

It’s not just the underground that is struggling this morning, Transport for London is saying:

No service between Surrey Quays and New Cross and SEVERE DELAYS between Highbury & Islington and West Croydon / Crystal Palace / Clapham Junction due to a signal failure at New Cross.

London Underground is accepting tickets via reasonable routes.

Piccadilly line

Our travel monitoring system INRIX is saying:

Severe delays on Piccadilly Line due to earlier track fault at Northfields. Tickets being accepted on London buses, Great Northern, South West Trains and Heathrow Connect services.

Further Piccadilly line issues

More problems on the Piccadilly line:

Circle Line

Another signal failure to blame for the Circle line delays:

Circle Line: Severe delays, clockwise only, due to an earlier signal failure at Aldgate East.

Hammersmith & City

Meanwhile on the Hammersmith & City line, here is the reason for the disruption is a signal failure:

Hammersmith and City Line: Severe delays due to an earlier signal failure at Aldgate East.

Piccadilly line

This is the latest from the Piccadilly line:

Piccadilly Line: Severe delays due to an earlier track fault at Northfields. Tickets accepted on London Buses, South West Trains and Great Northern.

Underground delays

There are currently delays on the following:

Central - Minor delays

Circle - Severe delays

District - Minor delays

Hammersmith & City - Severe delays

London Overground - Part suspended

Piccadilly - Severe delays