Chris Sutton, a chartered surveyor with Jones Lang LaSalle, said the metro would provide benefits to Cardiff, but could also transform the economic fortunes of towns like Pontypridd.
"If we can improve the infrastructure to a town like Pontypridd, then we can help regenerate it."
A conference on 'Making the Metro Happen', organised by the Metro Consortium is due to take place next Monday.
More top news
The first building has opened at Welsh history museum St Fagans as part of an ongoing multi-million pound redevelopment project.
Horeb surgery in Treorchy is closing because the health board has been unable to recruit a GP to keep it open.
The Labour leadership candidate was accused of misogyny for calling on Labour to 'smash' the prime minister 'back on her heels'