A 16-Minute Train Delay in Exeter Has Been Cited for 150 Years as the First Time the Sun Broke Human Technology. Physicists Just Proved the Date Was a Typo. The Railway Didn't Exist Yet.

For a century and a half, historians of space weather have pointed to the same event as the earliest known case of the sun interfering with human technology: the 10:05 p.m. train out of Exeter, in Devon, held for 16 minutes on October 18, 1841, because a "very intense magnetic disturbance" had scrambled the electric telegraph that told signalmen whether the line ahead was clear. An international team led by Lancaster University has now shown that the story is real, but the date is wrong by seven years, and the correction knocks it out of first place.

The problem was simple once someone looked. The railway line named in the account did not open until 1846, so a delay in 1841 was impossible. Jim Wild, a professor in Lancaster's School of Physics and Astronomy, and colleagues from the British Geological Survey, Natural Resources Canada, Baylor University, RMIT University and STFC RAL Space traced the claim back to an influential 1871 article in Nature and then went looking for what actually happened. The work is published in the American Geophysical Union journal Space Weather.

They combined Victorian railway timetables, digitized newspapers, sunspot observations, aurora sightings and early geomagnetic records from observatories. The evidence converged on October 18, 1848: a strong geomagnetic disturbance was recorded that night, sunspots had been reported in the preceding days, and auroras were seen across Britain and Europe. The 1841 date in the Nature article, the team concluded, was almost certainly a typographical error that has been copied ever since.

The correction reshuffles the record books. The Exeter delay remains one of the earliest documented cases of space weather disrupting infrastructure, but the earliest credible report is now interference with telegraph equipment on the Midland Railway in March 1847. The first practical telegraph networks had only been strung along British railways in the 1840s, and as the solar cycle climbed toward its peak, operators began noticing electrical effects they could not explain. Currents induced in long wires by a shifting magnetic field could ring bells, jam signals or give false "line clear" indications.

"Space weather is often discussed as a modern challenge because of our dependence on technologies such as satellites, communications systems and electricity networks," Wild said. "What this study shows is that society has been experiencing the effects of space weather on technology for almost as long as electrical technologies have existed." Mike Hapgood of RAL Space said the project "has a hint of a detective story" and underlined the value of preserving old records, which "give us the evidence base we need to interpret past events and strengthen future predictions."

The hazard has not gone away; it has moved. Railways still depend on signaling that can be upset by geomagnetically induced currents, and power grids, GPS and satellite communications are all far more exposed than a Victorian telegraph. Hapgood noted that the next solar cycle will peak in the 2030s, just as a wave of new space infrastructure comes online. The 1848 storm delayed one train by a quarter of an hour. A comparable storm today would be measured in outages, not minutes.