The rollout of a £750m integrated public transport network across south Wales faces a "marginal" delay due to the coronavirus crisis, its boss says.
James Price of Transport for Wales (TfW) said the South Wales Metro project, set to be completed in 2023, will be delayed for "months not years".
He said work on lines, funded by the Welsh Government and European Union, had already started.
It comes as TfW is nationalised after a drop in passenger numbers during Covid.
The Welsh Government has taken control two-and-a-half years after KeolisAmey won the £5bn Wales and Borders franchise contract.
Ministers have spent £167m to keep TfW afloat due to a loss of revenue during the pandemic.
The government-owned organisation will now take on the day-to-day running of services - which are currently only used by passengers whose journey is "essential".
"The good news is that the Metro has been secured through government and EU funding and that continues," said Mr Price, TfW's chief executive.
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