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Calls by Labour to renationalise some train services have been deemed "unnecessary".

Professor of transport at the University of South Wales, Stuart Cole, said experienced staff are needed.

Speaking to Â鶹ԼÅÄ Radio Wales, he said that while the "franchise system has not been performing" a public sector approach was not the answer.

Previously, Transport Minister .

Recently, Labour's shadow transport secretary, Michael Dugher, said more public control of the railways will result in a better service.

Prof Cole said: "Private companies run the railways under contract in the way Marriott hotels and McDonald's are run under contract - which have very strict guidelines.

"But what's been happening is that these guidelines have not been very strict [for the railways]."

He said the answer was a franchise system managed by "professional railway people rather than civil servants".