Sinkholes Force Rail Closures on Key Gatwick Airport Route

Rail passengers travelling between London and Gatwick Airport faced significant disruption after engineers discovered several sinkholes beneath a railway bridge near Purley during planned maintenance works.

The issue prompted Network Rail to close all lines between Purley and East Croydon as a precaution, severing one of the main rail links to Gatwick Airport and affecting thousands of passengers throughout the day.

According to Network Rail, engineers identified the sinkholes while carrying out scheduled engineering work south of Purley station. The defects had created voids beneath the track, allowing ballast—the crushed stone that supports railway tracks—to fall through gaps in the bridge structure.

As a result, sections of rail were left unsupported and became elevated above the remaining ballast, creating a potentially unsafe operating environment.

Images released by Network Rail showed a developing cavity beneath the track, highlighting the severity of the structural issue and the need for immediate intervention.

The closure caused widespread disruption across rail services serving Gatwick Airport, with passengers unable to travel directly between the airport and key London terminals including Victoria and London Bridge. The knock-on effects also extended beyond the railway, contributing to increased traffic congestion on roads surrounding the airport as travellers sought alternative means of transport.

In response to the disruption, Gatwick Airport advised passengers to consider different travel options and allow additional time for their journeys. The airport also warned that demand for replacement transport services could lead to longer waiting times while alternative arrangements were put in place.

Throughout the afternoon, Network Rail engineers carried out detailed inspections of the affected bridge to assess the extent of the problem and identify a safe repair solution.

Following the investigations, teams worked to stabilise the structure by filling and securing the sinkholes, enabling the track to be safely supported once again.

Later that evening, Network Rail confirmed that repairs had progressed sufficiently to allow services to resume. The organisation thanked passengers for their patience and apologised for the disruption caused by the emergency closure.

The incident serves as a reminder of the importance of routine inspection and maintenance activities across the rail network. While the discovery of the sinkholes caused short-term disruption, Network Rail said the defects were identified before they could develop into a more serious infrastructure failure.

The bridge involved in the incident was not publicly identified, but the discovery highlights the ongoing challenges of maintaining ageing railway assets while ensuring the safety and reliability of one of the UK's busiest transport networks.

With services restored, engineers will continue to monitor the site and assess whether any further remedial work is required to ensure the long-term integrity of the structure and the safe operation of trains on the route.