He produced a survey of the harbour and environs of Halifax, along with reports on transport feasibility to all parts of the province, and published a monograph Letters From Nova Scotia; comprising Sketches of a Young Country in 1830.
He had met his wife, Isabella Ann Morris, daughter of Lewis Wilkins, judge and head of the supreme court, in Nova Scotia.
Moorsom's survey of the valley of the Ouse allowed the railway line to be straightened, and eliminated the need for a large embankment.
Moorsom's brief in 1836 was to build the line as cheaply as possible, which he did by following open country, thereby avoiding populated areas where land prices were higher.
The general opinion at that time was that adhesion was not possible on such a steep incline and so the directors of the company set out to buy stationary engines for cable-haulage.
The loco they supplied had 4-foot (1.219 m) driving wheels, cylinder bore of 10+1⁄2 inches (267 mm), and 18-inch (460 mm) stroke, weighing 10+1⁄4 long tons (10.4 t)[5] Moorsom was also awarded the Telford Medal for his method of using iron caissons filled with concrete and masonry to form the foundations of a three-arch viaduct across the River Avon, near Tewkesbury.
The period of 1844–45 proved to be especially busy with new lines from Birmingham to Wolverhampton, Shrewsbury, Newton, and Chester,; the Yarmouth Junction, from Diss and Beccles, the Irish Great Western,[which?]
The Southampton and Dorchester Railway in 1847 was notable as "Castleman' Corkscrew": its promoters insisted that it should serve as many of the local communities as possible.
At this time, Moorsom surveyed the line[9] from Exeter and Plymouth to Falmouth, the West Cornwall Railway, from Truro to Penzance.
He occupied his retirement by writing a history of his regiment and died of cancer, after a long and painful illness, at his home, 17A Great George Street, Westminster, on 3 June 1863, aged 61, and was buried at Kensal Green cemetery.