He is best remembered as the designer of the distinctive Bristol and Exeter Railway 4-2-4T locomotives.
Pearson was the engineer responsible for the daily operations of Isambard Kingdom Brunel's ill-fated atmospheric equipment on the South Devon Railway.
Under his control the railway set up new locomotive works at Bristol Temple Meads.
The most significant locomotives designed by James Pearson were: Pearson married Jessy Agnes Mudge, eldest daughter of John Mudge, on 26 December 1850 at Brampford Speke, Devon.
[1] He died on 30 August 1891, aged 71, at his home in Gordon Road, West Ealing.