The man leading an independent review into cost savings in the UK's railways has said "there are opportunities to be more efficient" in almost every aspect of rail.
Sir Roy McNulty told the Today programme's John Humphrys that passengers and taxpayers are paying 30% more than their counterparts in other countries.
But he insisted that having one railway "is not the answer".
Transport expert Christian Wolmar disagreed and said the "railways are too fragmented". The "obvious solution", he said, is to bring back train operators and infrastructure together.
He went on to say that "people will not put up with increased fares" even though the government is "anxious" to reduce the cost to taxpayers.
Sir Roy said he expected that the government would undertake a "thorough review of fares structure" following this review.
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