George Stephenson
Later career

The next ten years were the busiest of Stephenson's life as he was besieged with requests from railway promoters. Many of the first American railroad builders came to Newcastle to learn from Stephenson and the first dozen or so locomotives utilised there were purchased from the Stephenson shops. Stephenson's conservative views on the capabilities of locomotives meant he favoured circuitous routes and civil engineering that were more costly than his successors thought necessary. For example, rather than the West Coast Main Line taking the direct route favoured by Joseph Locke over Shap between Lancaster and Carlisle, Stephenson was in favour of a longer sea-level route via Ulverston and Whitehaven. Locke's route was built.

Stephenson tended to be more casual in estimating costs and paperwork in general. He worked with Joseph Locke on the Grand Junction Railway with half of the line allocated to each man. Stephenson's estimates and organising ability proved inferior to those of Locke and the board's dissatisfaction led to Stephenson's resignation causing a rift between them which was never healed.

Despite Stephenson's loss of some routes to competitors due to his caution, he was offered more work than he could cope with, and was unable to accept all that was offered. He worked on the North Midland line from Derby to Leeds, the York and North Midland line from Normanton to York, the Manchester and Leeds, the Birmingham and Derby, the Sheffield and Rotherham among many others.

Stephenson became a reassuring name rather than a cutting-edge technical adviser. He was the first president of the Institution of Mechanical Engineers on its formation in 1847. By this time he had settled into semi-retirement, supervising his mining interests in Derbyshire – tunnelling for the North Midland Railway revealed coal seams, and Stephenson put money into their exploitation.
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