I'm reading Voice Across The Sea now and Arthur C. Clarke called Brunel, "the greatest engineering genius of the Victorian era - perhaps, indeed, the only man in the last five hundred years to come within hailing distance of Leonardo da Vinci."
His dad was remarkable as well. Brunel cut his teeth on his father's Thames tunnel project (https://en.wikipedia.org/wiki/Thames_Tunnel). There is a little Brunel museum on the site of the project's steam engine. Well worth a visit if you are in the area.
Brunel makes occasional appearances along side Ada Lovelace and Charles Babbage in Sydney Padua's alternative-history web comic "2D Goggles", which is worth your time...
https://en.wikipedia.org/wiki/Isambard_Kingdom_Brunel#Brunel...