Mayor of London Boris Johnson made a whistle-stop tour of Enfield Town station on the day Transport for London took over the line.

The Mayor inspected the refurbishments along the line, previously run by Abellio, which runs through Bush Hill Park and Edmonton Green stations before terminating at Liverpool Street.

But Mr Johnson would not be comment on adding more trains to the line, which has four an hour between 7am and 8am and from 5pm to 6pm but just two an hour for the rest of the day.

He said: “I do not know how many we will be adding to the line. Over time I expect it to increase but we cannot commit to anything now.”

Transport for London has also taken over the running of Cheshunt to Liverpool Street line, which passes through Turkey Street and Southbury station, and where commuters will see a reduction in fares.

TfL is set to pump hundreds of millions of pounds into buying new trains by 2018, with older trains cleaned up and brought back into use.

Showing off a refurbished train, he said: “It will integrate the service properly with all of TfL’s other services and a greater frequency and a real commuter network that will be popular and reliable service.”

Mike Stubbs, TfL’s director of London Overground, said there will be more staff at train stations, including added security at Enfield Town station as well as cleaning older trains for use.

In addition to refurbishments, signs and rail maps have been turned orange at all stations.