Mr. Ivo Hugh is the former Chief Mechanical Engineer of the Skarloey Railway. He retired sometime before the events of New Little Engine, and his son, Ivo Hugh II, took over his position. He was later honoured by having Ivo Hugh named after him. It is revealed in Gallant Old Engine that, while Rheneas was solely running the Skarloey Railway, Mr. Hugh was the sole driver and fireman for the railway. After Rusty's arrival, he also became his driver. He also had a private transportation vehicle on the Skarloey Railway, Mark V.