The Elizabeth line has been partly suspended after a faulty train caused severe disruption across much of the route, while drivers faced lengthy delays on the M25 following a crash near Gerrards Cross.
There is currently no service between Abbey Wood and Paddington. Severe delays are also affecting the rest of the line as Transport for London works to remove the faulty train at Paddington.
Earlier on Tuesday, a collision on the M25 caused major congestion on the clockwise carriageway near the Chalfont Viaduct.
Latest travel updates
No trains are running between Abbey Wood and Paddington on the Elizabeth Line. Severe delays remain on much of the rest of the line.
There are only minor delays between Whitechapel and Shenfield.
Tickets are being accepted on London Underground, London Buses, Great Western Railway, Chiltern Railway, Southeastern and Thameslink services via any reasonable route.
Passengers are advised to check their route before travelling and allow extra time for their journey.
M25 crash sparks delays on the Elizabeth Line
The collision happened on the clockwise carriageway between junctions 16 and 17, near the Chalfont Viaduct.
At the height of the disruption, three lanes were closed, with only one lane open and queues stretching back towards Heathrow. Delays were reported at around 45 minutes.
All lanes have since reopened following recovery work, but National Highways warned of residual delays of more than 30 minutes and around six miles of congestion.
The crash also caused knock-on delays on the M40 towards London.
The Elizabeth line continued to experience severe delays across most of the route following the faulty train at Paddington.
Services between Whitechapel and Shenfield were operating with only minor delays, but passengers travelling between Abbey Wood, Paddington, Heathrow Terminals and Reading were warned to expect disruption.
Travel information may change throughout the day as TfL and National Highways respond to the incidents.
