Operator Northern said the broken down train was blocking lines between Sheffield and Meadowhall but added that there were still some cancellations and delays of up to 30 minutes.
It said services between Sheffield and Meadowhall were affected.
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Train tickets are being accepted on Supertram services between Sheffield and Meadowhall and tram-train services between Sheffield and Rotherham.
Northern said it expected services to return to normal ‘in the next few hours’.