Chiltern Railways is set to experience significant service disruptions as essential engineering work is scheduled on the Chiltern Main Line between March 14 and 15, 2026. During this period, no Chiltern Railways services will run into or out of London Marylebone, impacting countless commuters and travelers.

The engineering work aims to improve the reliability of services and provide smoother journeys for years to come. This includes the replacement of old rail sleepers with new concrete ones, as well as updates to track and ballast. Additionally, work will be conducted on track switches and crossings approaching London Marylebone.

Rail replacement buses will be in operation between Bicester North and Bicester Village, and between Gerrards Cross and Hillingdon, to assist passengers during the service interruptions.

The need for these upgrades comes in the wake of a tragic incident on March 9, 2026, when a person died after a track incident at Northolt Park station. Following this incident, all Chiltern Railways lines between London Marylebone and Princes Risborough were closed, leading to severe delays of up to 120 minutes across the line.

Michael Stewart, a spokesperson for Chiltern Railways, acknowledged the inconvenience, stating, “I understand that no trains to or from London Marylebone for an entire weekend will significantly inconvenience our customers.” This sentiment reflects the challenges faced by commuters who rely on these services.

Neil Gaskin, another representative, emphasized the importance of the upcoming upgrades, saying, “These upgrades are vital to ensuring trains run reliably and on time.” The engineering work is designed to address long-standing issues and enhance the overall performance of the rail network.

As the scheduled dates approach, further updates regarding the progress of the engineering work and any additional disruptions are expected. Details remain unconfirmed regarding any potential extensions to the service interruptions or additional measures that may be implemented.

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