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The only problem a Metro-Link tram has is wheel profile, orginally the tyres were turned to a profile which was slightly different from a heavy rail one, but could still run on the original BR tracks on the Altrincham and Bury lines and the new city centre and Eccles routes.
Since the track was relayed they have been turned to a tram profile which is ok on plain rail track but can have problems on check rails and pointwork on the heavy rail system.
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