Network Rail's Southern region has begun applying a special white paint to sections of its railway tracks in a proactive measure to mitigate the impact of rising summer temperatures. This innovative approach aims to keep the steel rails cooler, thereby reducing the risk of heat-related track damage and the subsequent disruption to train services.
The white paint works by reflecting sunlight, which can significantly lower the temperature of the tracks. Network Rail estimates that this treatment can reduce rail temperatures by as much as 10 degrees Celsius. Steel rails are designed to expand in heat, but extreme temperatures can cause them to buckle, leading to what is known as 'sun kinks'. When this occurs, trains must slow down or services may be cancelled to ensure safety, causing delays for passengers.
The Southern region, which encompasses a vast network serving Kent, Sussex, Surrey, and parts of Hampshire and South West London, is particularly susceptible to these issues during periods of hot weather. Engineers are strategically applying the paint to specific locations identified as vulnerable to high temperatures and expansion, ensuring that resources are focused where they are most needed.
This initiative is part of a broader package of preparations undertaken by Network Rail ahead of the summer months. These measures include comprehensive inspections of the track infrastructure, monitoring of weather forecasts, and the readiness of response teams to address any issues promptly. The goal is to enhance the resilience of the railway network and maintain reliable services for commuters and other travellers.
The use of white paint is a relatively low-cost yet effective solution that has been trialled in previous years and is now being expanded. By preventing tracks from reaching critical temperatures, Network Rail hopes to minimise the need for emergency speed restrictions, which often have a knock-on effect across the network and lead to frustration for passengers.