The £1.5 billion deal will also see new fleet rolled out across the network.
Earthquake Felt In Suffolk
A 4.3 magnitude earthquake in Kent has been felt in some parts of Suffolk.
It struck at around 3am and the European-Mediterranean Seismological Centre, based in Paris, tweeted: "M4.3 earthquake strikes 46km SE of Southend-on-Sea (United Kingdom).''
Kent Police says it has been inudated with calls about it.
The force tweeted: "We are aware of reports of tremors being felt by residents in East Kent & are monitoring the situation. No injuries have been reported.''
Suffolk's Police and Fire Service has told Heart they have had no calls about it.
On Twitter, people in Ipswich, Kesgrave, Felixstowe and Harwich have reported feeling tremors.
@itfcdanny said: "Woken around 3am by an earthquake here in #ipswich thought we was dreaming when the house and wardrobes shook!!"
@Lee_9_ said: "Thought I was dreaming earthquake tremors but wasn't"
@brionypaigex said: "Oh my god I wondered what woke me up a minute ago, was it actually an earthquake?!??"
Residents in Kent tweeted their reactions after being awoken by the tremors.
Vikki Petts said: "So we just had a 4.3 magnitude earthquake in Kent and my housemates slept through the entire thing. certainly woke me up!''
Jonathan Tapp said: "Earthquake in East Kent and now can't get back to sleep. Despite months spent in NZ this is my first one that I've felt.''
Iain Buchanan said: "So I'm not going mental, my house shook due to an earthquake in Kent of all places. Thank god for 24 hrs news & social media to find out.''
The British Geological Survey said earthquakes similar in size to the one that struck Kent happen around every two years in the UK and about 4,500 times a year across the world.
It tweeted: "Today's 4.2 magnitude Ramsgate earthquake is approx 260,000 times smaller than the 7.8 NepalQuake event.
"This morning's earthquake is approx 25km north-east of the 28 April 2007 Folkestone earthquake which had a magnitude of 4.3 ML.''
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