Since launching London Overground in 2007 we have:
London Overground is now one of the most reliable train operators in the country, and is rated one of the best by customers.
Around a third of all Londoners are within walking distance of a London Overground station.
There are six London Overground routes that, together, form an Outer London orbital network:
Every three months we measure customer satisfaction and get consistently high scores.
A number of organisations work together to manage the London Overground network, but we have overall responsibility for delivering a seamless service to our customers.
We set the specifications for train frequency, station facilities and overall performance, and are responsible for fares and revenue.
We also plan and fund improvements and extensions to the network.
Arriva will begin to manage the network's stations and trains on a day-to-day basis from November 2016. Arriva replaces London Overground Rail Operations Ltd which was appointed as operator in 2007.
Network Rail manages and maintains most of the track and signals, as London Overground is part of the National Rail network.
Most London Overground services run on tracks owned by Network Rail and shared with other train operating companies. This means track, signalling and infrastructure such as bridges are in almost constant use. Network Rail schedules regular and comprehensive maintenance to ensure everything is in good order.
The network sometimes has to close because Network Rail is doing maintenance or because we are. Wherever possible we schedule our work to take place at the same time as Network Rail.
We usually carry out maintenance at the weekend when there are fewer passengers. Here are a few ways you can get advance warning: