Scientists Correct 178-Year-Old Train Delay Date Caused by Solar Storm

An international team of scientists has corrected a 178-year-old historical error, confirming a train delay in England caused by space weather occurred on October 18, 1848, instead of the previously believed date of October 18, 1841[1][2]. The incident involved a 10:05 p.m. train departing Exeter, which was delayed by 16 minutes due to magnetic interference with telegraph systems[2].

This correction offers a clearer historical understanding of how solar events affect emerging technology[1]. It reveals the ongoing vulnerability of modern infrastructure, including power grids, satellites, and communication networks, to similar space weather disruptions[1][2].

What the records show

An anonymous report published in the journal Nature in 1871 described a "very intense magnetic disturbance" on October 18, 1841, that delayed a 10:05 p.m. train from Exeter by 16 minutes[2]. The delay was attributed to magnetic interference that disrupted the railway's telegraph system, preventing operators from confirming a clear line near Starcross[2]. However, the railway line from Exeter to Starcross, part of the South Devon Railway, did not begin operations until 1846, making the 1841 date impossible[2][3][8].

An international research team, led by Professor Jim Wild of Lancaster University, investigated this discrepancy[3][12]. The team included experts from RMIT University, the British Geological Survey, Natural Resources Canada, Baylor University, and RAL Space[3][12]. Their investigation involved cross-referencing historical railway timetables, contemporary newspaper reports, observations of solar activity, records of auroras, and digitized geomagnetic measurements from the Greenwich Observatory[3][11]. The combined evidence strongly indicated October 18, 1848, as the true date of the incident[3]. Railway timetables confirmed the 10:05 p.m. train schedule from Exeter was in effect during 1848 and 1849[5][8]. Records from the Greenwich Observatory showed significant magnetic disturbances on the evening of October 18, 1848[8][11]. Period newspapers reported vivid auroras visible across England on that date, and an astronomer's drawing from October 19, 1848, by Temple Chevallier, depicted an unusually large group of sunspots, signifying heightened solar activity[2][8].

Timeline

The initial anonymous report appeared in the journal Nature in 1871[2]. Space weather historian William B. Cade III of Baylor University rediscovered this report in 2013, highlighting it as a potential early example of space weather affecting human technology[2][9]. A critical inconsistency was later identified because the railway line through Starcross did not open until 1846[3][8]. The international research team undertook a comprehensive investigation, ultimately publishing their findings in the journal Space Weather[3][10]. The corrected timeline places the Exeter incident on October 18, 1848[1][3].

What changed and for whom

This corrected timeline clarifies that while the Exeter incident remains one of the earliest documented cases of space weather affecting technology, it is not the very first[3][10]. An earlier credible instance occurred on March 19, 1847, when geomagnetic activity affected the Midland Railway's telegraph system[3][8]. The re-dating of the Exeter incident shifts the understanding of when and how early electrical systems first encountered the space environment[7][9].

What the subject has said publicly

Associate Professor Brett Carter of RMIT University stated, "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"[3]. Professor Jim Wild noted the significance of the event, stating, "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"[7][10].

What we could not confirm

PrimaryBrief could not confirm the identity of the anonymous author who published the original report in Nature in 1871.