At the time of the Grouping in 1923, the North British Railway became part of the London and North Eastern Railway (LNER), while the Caledonian Railway became part of the London, Midland and Scottish Railway (LMS).
(see List of transport undertakings transferred to the London Passenger Transport Board)
It noted that the railway system, then organised into several regional companies, probably had no need for many of the small branch lines and services, as motor transport had shown itself to be more efficient for local deliveries.
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Opened by the North British Railway in 1874 on their route linking the Glasgow, Dumbarton and Helensburgh Railway at Maryhill to Queens Dock (the site that is now occupied by the Scottish Exhibition Centre) on the north side of the River Clyde (the Stobcross Railway), it became part of the London and North Eastern Railway during the Grouping of 1923.
Later he switched to 7 mm scale modelling, building Kendal, Kendal II and Kendal Branch the latter of the earlier pre-grouping period of the London and North Western Railway (LNWR).
He was the last chairman of the GNR, which lost its identity when, under the Railways Act 1921, it was grouped with several other railways on 1 January 1923 to become a constituent of the London and North Eastern Railway (LNER).
The Grouping in 1923 of Britain's financially troubled railways saw the GNR subsumed into the new London and North Eastern Railway (LNER), and Gresley was appointed the CME.