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Debate over rail or tram system for south Wales

6 August 2014 Last updated at 20:01 BST

Should the electrification of the railway line between the south Wales Valleys and Cardiff be scrapped in favour of a tram system?

One rail industry expert has told BBC Wales Today that trams would be cheaper and more effective.

Electrification is a key part of the metro project which, it is hoped, will improve transport links into the capital city by 2030.

Business correspondent Brian Meechan reports.