People travelling towards east London on the opening day of the Olympics have suffered main line and Tube delays as public transport battled to hold its own in the face of vastly increased traffic.
One of the key hold-ups was at North Greenwich, where the Games' gymnastics and basketball is being held.
The North Greenwich problem was a signal failure on the Jubilee line - just two stops from the main Olympic station at Stratford.
Those heading to London from East Anglia were delayed by a broken-down train at Ingatestone in Essex.
There were also delays into another major London terminus - Euston.
These were caused by a signalling problem at Bletchley in Buckinghamshire which affected passengers on London Midland, Southern, and Virgin Trains services.
Also, First Capital Connect and Southeastern train services were affected by a lineside fire at Herne Hill in south London.
Network Rail (NR) and the Association of Train Operating Companies (Atoc) said a total of nearly 444,000 extra main line train seats were being provided on Friday.
In all, four million seats were on offer, thanks to the running of extra services and longer trains.
NR and Atoc said that at noon, 92% of services were running to schedule across the network.
On the Tube there were minor delays on the Victoria line due to staff illness.