A mysterious train delay nearly 180 years ago has led scientists to uncover a surprising mistake in the history of space weather. An international research team has solved a 178-year-old mystery involving one of the earliest documented cases of solar activity interfering with electrical technology.
The incident dates back to the 1840s, when electric telegraph networks were beginning to transform long-distance communication. As these early systems expanded, operators occasionally encountered strange electrical disturbances that could disrupt their equipment. Scientists now understand that some of these problems were caused by changes in Earth’s magnetic field triggered by activity on the Sun.
Researchers led by Lancaster University have revisited a historical account of a train delayed in Exeter, England, when solar activity interfered with the railway’s telegraph system. The investigation involved scientists from RMIT University, the British Geological Survey, Natural Resources Canada, Baylor University, and the UK’s national space laboratory, RAL Space.
By piecing together historical documents and scientific observations, the team uncovered an error that changes the timeline of the earliest known technological disruptions caused by space weather.
How Solar Storms First Disrupted Technology
One of history’s most dramatic examples of space weather affecting technology occurred in 1859. Known as the Carrington Event, the powerful solar storm involved a massive solar flare and a coronal mass ejection, an enormous eruption of charged particles and magnetic fields from the Sun.
The resulting disturbances produced spectacular auroras, commonly known as the northern lights, that appeared as far south as Hawaii and Central America. In some locations, the sky glowed brightly enough for people to read newspapers at night. The unusual illumination even fooled gold miners into thinking morning had arrived, prompting them to prepare breakfast shortly after midnight.
The storm also wreaked havoc on telegraph networks around the world. Electrical surges caused equipment failures, sent sparks flying from wires, shocked operators, and even started fires. In some cases, the electrical currents generated by the disturbance were so powerful that telegraph systems continued operating without batteries.
Although the Carrington Event remains the most famous example from this period, evidence of solar activity interfering with electrical systems stretches back even further.
In 1871, an anonymous author published an account in the scientific journal Nature describing a “very intense magnetic disturbance” that supposedly occurred on October 18, 1841. According to the report, the disturbance interfered with railway signals in Exeter and delayed the scheduled 10:05 p.m. train departure by 16 minutes.
If the date had been correct, the event would have represented the earliest known instance of space weather disrupting human technology.
However, a new investigation published in the American Geophysical Union journal Space Weather has revealed that the original account contained a significant historical error.
The Railway Mystery That Changed Solar Storm History
Associate Professor Brett Carter, a space weather researcher at RMIT University, helped investigate the historical records. During the investigation, the team noticed a problem that immediately called the original timeline into question.
The Exeter-to-Starcross railway line mentioned in the report did not open until 1846, almost five years after the event supposedly occurred.
“In this study, we effectively investigated what had to be a typo in a Nature paper from 1871. We know it was a typo because the Exeter-to-Starcross train line mentioned in that paper didn’t exist until 1846, which is 5 years afterwards,” he said.
To establish when the train delay actually happened, the researchers examined a wide range of historical evidence. They compared railway timetables and newspaper reports with observations of solar activity, accounts of auroras, and digitized measurements of Earth’s magnetic field.
Together, these records pointed to a different date: October 18, 1848, exactly seven years later than originally reported.
The revised timeline resolves the apparent contradiction and places the incident during an important period in technological history, when electrical communication systems were becoming increasingly widespread.
Carter explained that the 1840s marked a turning point in humanity’s relationship with space weather. Solar disturbances had always occurred, but the emergence of electrical technology meant that their effects could now interfere directly with everyday human activities.
“Understanding this historical event is important because the 1840s mark the intersection between the rise of our technological age and space weather, which has always been around,” Carter says.
“Since this line was crossed, humans have not looked back.”
The findings also change the incident’s place in the historical record. Although the Exeter disruption remains one of the earliest credible examples of space weather affecting technology, it can no longer be considered the first.
That distinction now belongs to an earlier documented incident involving telegraph interference on Britain’s Midland Railway in March 1847.
Why the 178-Year-Old Discovery Matters
Professor Jim Wild of Lancaster University, who led the study, said the findings demonstrate that the dangers associated with space weather began affecting society long before the development of modern power grids, satellites, and electronic communication networks.
“What this research highlights is that space weather is not a new threat but a long-standing natural hazard. Society has been experiencing the effects of space weather on technology for almost as long as electrical technologies have existed,” Wild said.
The Exeter incident is especially significant because it occurred when electrical technology was still in its infancy. Early railway operators were beginning to rely on telegraph systems, creating new opportunities for solar disturbances to interfere with essential infrastructure.
“The Exeter train delay is a fascinating story because it sits right at the point where emerging technologies first began to encounter the realities of the space environment. By combining historical archives with scientific observations, we’ve been able to show that the event almost certainly happened in 1848 rather than 1841.
“Although this means it is not the earliest recorded space weather impact, it remains one of the first clear examples of solar activity disrupting critical infrastructure,” he said.
The investigation also shows how historical scientific records can be used alongside newspapers and other archival materials to reconstruct events that occurred long before modern monitoring instruments became available.
“It also demonstrates the value of combining scientific records with contemporary newspaper reports and archival documents when reconstructing historic space weather events.”
Dr. Mike Hapgood, a Visiting Scientist and space weather expert at the UK’s national space laboratory, RAL Space, described the research process as something resembling a detective investigation.
“It highlights the importance of preserving these older records, which give us the evidence base we need to interpret past events and strengthen future predictions,” he said.
Modern Technology Still Faces the Threat of Solar Storms
Almost two centuries after the Exeter train delay, solar storms continue to pose risks to railways and other essential infrastructure. The technologies involved have changed dramatically, but they remain susceptible to disturbances originating from the Sun.
Today, space weather can interfere with electrical power systems, railway signaling equipment, satellite navigation, and communication networks. Powerful solar events can disturb Earth’s magnetic field, potentially generating unwanted electrical currents in infrastructure and affecting systems that depend on reliable satellite signals.
Scientists now have far more sophisticated instruments and forecasting methods than were available in the 19th century. However, Hapgood emphasized that modern society’s growing dependence on interconnected electrical and space technologies also creates new vulnerabilities.
Understanding how past solar storms affected infrastructure can help researchers assess the dangers posed by future events and develop better ways to reduce potential disruptions.
“Deepening our understanding of these events is essential for preparing for, and mitigating, the impacts of space weather – especially as we look forward to a decade of exciting space developments that will face the challenge of a new solar cycle in the 2030s,” he said.
