The Crossrail 2 - a new rail link between south west and north east London - project has received overwhelming support from the public according to public consultation.
The Mayor of London has hailed the project as crucial in relieving congestion, boosting economic growth in the capital, and offering a vital interchange if the high speed HS2 national rail service goes ahead.
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Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.