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The Midland Main Line (MML), a major railway line in the United Kingdom, has been undergoing various upgrades since 2015. The current programme of upgrades began in 2012, although electrification was proposed a number of times previously. The current programme includes electrification of the railway line between Bedford, Wellingborough, Corby, Leicester, Derby, Nottingham and Sheffield. The routes between Nottingham and Sheffield and the Erewash Valley line were not included at this time, only the line between Derby and Sheffield. The upgrade was part of the HLOS (High Level Output Specification) for Control Period 5 published by the UK Government in 2012.
To enable all the benefits of using electric traction, the line from Bedford to St Pancras is also being upgraded which includes boosting the power supply. Parts of the line have been classed as congested infrastructure hence another reason for the upgrade.
The upgrading of the overhead line equipment (OLE) south of Bedford is underway to allow 125 mph (201 km/h) running and due for completion in late 2025. The Kettering to South Wigston stretch was energised in July 2024.