Network Rail, CATALYST test satellite risk alerts on Wessex Route

Network Rail and CATALYST completed a 12-week pilot on the Wessex Route that used satellite imagery, radar analytics and weather forecasts to spot flooding and vegetation risks up to three days ahead. The project could help rail teams target inspections, clear hazards sooner and cut weather-related disruption on one of Britain’s most climate-sensitive rail corridors.

Why it matters: - Britain’s rail network is facing more weather-driven disruption from heat, prolonged rainfall and changing vegetation conditions. - Earlier warnings could help Network Rail and other operators focus inspections, prioritize resources and reduce avoidable service disruption. - The pilot also points to a potential shift from infrequent vegetation checks to more continuous, evidence-based monitoring.

What happened: - Network Rail and CATALYST completed a 12-week exploratory pilot on the Wessex Route. - The work tested whether satellite imagery, InSAR analytics and weather forecasting could identify infrastructure risks before a weather event. - The pilot produced a prototype Earth Observation decision-support tool for flooding and vegetation risk. - The prototype was built with Network Rail’s Wessex Route Operations and Resilience teams. - The route covered includes the major commuter area of south-west London.

The details: - The prototype combines satellite-derived risk indicators with short-range weather forecasts. - The system was designed to give route teams visibility up to three days ahead of forecast weather. - The tool generates location-specific forecasts for three hazard classes: ground deformation, vegetation fall-in and flooding. - A baseline layer measures long-term vulnerability using three years of satellite imagery, LiDAR-based vegetation height models, and national flood and terrain datasets. - A forecast layer applies up to three days of meteorological data, including cumulative rainfall, peak rainfall intensity and wind gusts. - The solution includes an interactive web dashboard with traffic-light classification. - Results are refreshed daily across three rail segments on the Wessex Route. - Network Rail’s infrastructure portfolio includes 20,000 miles of track and 30,000 bridges, tunnels and viaducts.

Between the lines: - The pilot is aimed at separating persistent risk from day-to-day weather amplification, which could make operational decisions more precise. - Early feedback from Wessex Route users said the outputs were broadly consistent with known risk areas. - Tree fall risk was flagged as a potentially valuable insight. - The approach could be especially useful where vegetation assessments currently happen only every three years. - A satellite-enabled workflow could support earlier identification of high-risk corridors and better deployment of vegetation teams. - The companies said the method could eventually scale across the rail network and add hazard classes such as wildfire risk and autumn leaf-fall adhesion.

What's next: - Network Rail and CATALYST said the prototype needs further development and validation before broader use. - Further testing could determine whether the system can support targeted inspections, routing decisions, speed restrictions and vegetation clearance. - The partners said the approach could be expanded to additional climate-sensitive rail regions.

The bottom line: - The pilot suggests satellite analytics and weather forecasts could become a practical early-warning layer for rail infrastructure risk management.