Mr Hahn said the line, scheduled to open on Tuesday, would boost the UK economy by £ 42 billion and create “hundreds of thousands” of jobs.
“I’m glad the Elizabeth line will open on Tuesday – it’s a big moment, not just for London but the whole country, and especially in this special anniversary year, ”he said in a statement on Sunday.
“This is the most significant addition to our transport network in decades, and I am sure passengers will enjoy modern trains, beautiful stations without steps and reduced travel time in the capital and the south-east.”
He added: “It’s much more than just a new railway – the Elizabeth line will help turbo-charge our recovery from the pandemic, providing £ 42 billion to the UK economy and hundreds of thousands of new homes and jobs.”
City Hall said 62 per cent of the contracts concerning the line had been transferred to companies outside London.
They also predict that the new route will create about 90,599 new homes.
The line stretches from Reading in Berkshire and Heathrow Airport in west London to Shanfield in Essex and Abby Wood in south-east London.
It is named after the Queen, who visited Paddington Station on Tuesday to mark the completion of the Crossrail.
Crossrail, a project to build a new east-west railway, has been delayed and exceeded the budget due to many problems, including difficulties in building and complications with the installation of alarm systems.
It was due to be completed in December 2018, and in 2010 a budget of £ 14.8 billion was set.
The total cost is estimated at £ 18.9 billion, including £ 5.1 billion from the government.