Working throughout Sunday 23 June, the work includes upgrading the signalling system on the Midland Main Line between London St Pancras and Wellingborough resulting in changes to train services.
Also on 23 June, further work in central London means there will also be no Thameslink services between St Pancras and London Bridge, or between St Pancras and Sutton/Wimbledon.
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Separately to the Midland Main Line work, teams will be laying new track between Leicester and Peterborough on 22-23 and 29-30 June, with buses replacing CrossCountry trains to Melton Mowbray, Oakham, and Stamford.
Customers travelling with East Midlands Railway (EMR) and Thameslink services should plan ahead by visiting www.nationalrail.co.uk or by checking with their individual train operator.
Mark Budden, route director for Network Rail's East Midlands route, said: "Upgrading the signalling system is vital to keep services running safely and reliably. It’s a technically complicated piece of work so we cannot run any trains through the area while we carry it out.
"I'm sorry for the disruption this will cause to journeys for some passengers. Please make sure you plan ahead before setting off and check to see if your journey will be different to usual.
"We want to thank customers for their understanding while we carry out these essential improvements."
