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of Inverness, Scotland.
The Highland Railway (HR) was one of the smaller railways before the grouping; it operated north of Perth railway station in Scotland and served the farthest north and south of Britain. 
The Chief Engineer (CE) of the originally proposed Perth and Inverness Railway was Joseph Mitchell. He held the same post for the Inverness and Nairn Railway, the Inverness and Aberdeen Junction Railway, the Inverness and Perth Junction Railway (that is the three that merged to form the Highland Railway). He relinquished the post in 1863. The work was then carried out by a private company (which just happened to be the one run by Mitchell), an arrangement that was terminated in June 1865 when the merger that formed the Highland Railway took effect.
1865 The company dates, under its present title, from 1865.
1888 See Locomotive Stock June 1888
1908 The number of miles of line owned is 485. 
1923 Absorbed into the London, Midland and Scottish Railway.