Network Rail is confident that the £100 upgrade to track and signals in Nottinghamshire will provide huge benefits despite weeks of disruption ahead.
Justin Page, Route Master for the East Midlands, said when finished, the work will mean shorter journey times, more trains and a more reliable service in the county and throughout the region.
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An engineer has been confirmed dead in the crash in Wales. The RAF say the pilot survived and is receiving treatment.
A Red Arrows jet has crashed after an incident at RAF Valley in north Wales, the Ministry of Defence has said.
It has been confirmed that the Red Arrows pilot survived the crash but unfortunately, the passenger, an RAF engineer, died.