A bridge has been partially blocked over the M25 in Buckinghamshire.

Hornhill Road is partially blocked eastbound from Shire Lane to the Hawthorns after a crash at about 8.30am.

The Metropolitan line has been hit by severe delays just as passengers are trying to get to work on the busy commuter line.

The latest TfL travel status update shows there are severe delays between Harrow-on-the-Hill to Watford due to train cancellations.

A stretch between Wembley Park to Harrow-on-the-Hill has minor delays because of an obstruction on the track.

Greater Anglia services are slowly returning to normal after a points failure in the Ely area.

Passengers still face cancellations, delays of up to half an hour and revisions between Norwich and Stansted Airport, and Ely and London Liverpool Street.

Trains are queueing up on the tracks which is why services could still be disrupted until about 9.30am.

South Western Railway trains between London Waterloo and Chessington South face disruption this morning after a points failure.

The failure, which happened between Malden Manor and Chessington South, means all lines are blocked and trains cannot run between these stations.

Instead, services will start and terminate at Hampton Court, with disruption expected until 11.30am.

• Trains between London Waterloo and Chessington South will be diverted to and from Hampton Court, with additional stops at New Malden and Surbiton in both directions

Thameslink services between London Blackfriars and Sutton could be delayed, cancelled or revised after a shortage of depot staff.

Some trains have been unable to leave the depot so fewer trains are able to run.

Trains running through St Albans City and West Hampstead are also affected.

National Rail said the issue is expected to last until 8.30am.

Heavy rain and strong winds caused by Storm Bert over the weekend still affects some train routes, including in the Midlands and the Northampton area where the station tracks were flooded.

London Northwestern Railway is running a reduced service from London Euston while some routes are suspended.

Here are the affected routes from London Euston station.

• Two trains per hour will run between Milton Keynes Central and London Euston
• Trains between Birmingham New Street and London Euston via Northampton will run between Birmingham New Street and Milton Keynes Central only
• Trains between Tring and London Euston are suspended
• Around one in three trains between Crewe and London Euston will be cancelled

If you’re travelling on Southern services, prepare for possible delays of up to 15 minutes after an earlier fault on a train near Shepherds Bush.

While service is now returning to normal, residual delays or schedule revisions are still likely until 7.30am on trains between Watford Junction and Shepherds Bush, National Rail said.

While most of the TfL network is coping better than yesterday after a trackside fire, alerts and persistent Elizabeth line disruption, part of the Tube remains suspended.

• Piccadilly line – No service between Rayners Lane and Uxbridge due to poor rail conditions caused by significant leaf fall while the rest of the line has good service
• Metropolitan line – Minor delays Moor Park to Watford due to train cancellations and Wembley Park to Harrow-on-the-Hill due to an obstruction on the track
• London Tramlink – The earlier suspended service between Therapia Lane and Wimbledon has resumed and the issues have been downgraded to minor delays due to power supply problems