The £1.5 billion deal will also see new fleet rolled out across the network.
Mum Jailed for Killing Children...
47 year old Teresa Riggi, who used to live in Corton near Lowestoft in the late ninties with her husband who work for shell in Lowestoft, killed her eight year old twin boys and five year old daughter
she'd been worried she would lose the children, who were all born in Norwich, in a custody battle.
The bodies of eight-year olds Autin and Luke, and their five year old sister Cecilia were found at her flat in Edinburgh last August, after a gas explosion there.
They'd been stabbed.
Riggi was initially charged with murder but last month admitted three counts of the lesser charge of culpable homicide on the grounds of diminished responsibility.
In a statement read by David Sinclair of Victim Support outside Glasgow's High Court, the children's dad, Pascquale Riggi, said he was devastated he couldn't protect them: "As a father, my natural instincts were geared towards safeguarding my children from the dangers of this world.
"It pains me to the core that I was unable to protect them from the selfish, brutal and murderous act that ended their lives so unfairly.
"They are in my thoughts when I wake in the morning and before I go to sleep at night.
"They were such wonderful, energetic, bright and happy children."
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