Passengers have been warned ahead of “major disruption” during the early May bank holiday weekend as work at Kings Langley and Euston is underway.

Rail engineering work to make overhead electric wires more resilient against hot weather will cause major disruption at one of the UK’s busiest stations on April 29 and 30, during the early May bank holiday weekend.

Network Rail said no London North Western Railway services will run to or from Euston on Saturday April 29, while the station will be closed to all mainline operators the following day.

Network Rail said its improvement work on the West Coast Main Line over the bank holiday weekend includes “overhead line work to prepare for hot weather” at Euston and Kings Langley.

In hot weather, older overhead lines that provide power to trains can expand and sag, often resulting in delays.

On April 29 no London Overground services will operate between Willesden Junction and Watford Junction, with a half-hourly reduced service between Euston and Willesden Junction.

The work on Sunday April 30 will add several hours to the journeys of thousands of Avanti West Coast passengers who planned to travel between London and destinations in the West Midlands, north-west England and Scotland.

On that day bus replacement services will be in place between Stanmore (London Underground Station), Watford Junction, and Milton Keynes Central. No London Overground services will operate between Euston and Watford Junction.

Jake Kelly, Network Rail’s system operator director, said: “The majority of the rail network will be open as usual for passengers travelling over the bank holiday weekend, but we do have some vital upgrade work taking place to improve journeys in some areas, so please check before you travel, either with your train operator or using National Rail Enquiries.

“There’s never a good time to impact rail services, but with fewer passengers typically travelling over the bank holidays, we have the opportunity to complete vital work to provide better and more reliable journeys whilst minimising disruption for our passengers and freight users.”

More information is available from train operators or by visiting www.nationalrail.co.uk.