Revenue stamps of the United Kingdom
When Ireland was partitioned into Northern Ireland and Southern Ireland in 1921, separate revenue stamps were issued for both entities. Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps). However, Northern Ireland continued to use separate revenue stamps until the 1980s. Northern Irish revenues include Civil Service, Dog Licence, Excise and National Insurance stamps, among many others.
Steam locomotives of Ireland
The West Donegal Railway became the Donegal Railway in 1892; and the County Donegal Railways Joint Committee after being jointly acquired in 1906 by the Great Northern Railway (Ireland) and the Midland Railway's Northern Counties Committee.
The Great Northern Railway (Ireland) straddled the border between the Republic and Northern Ireland (after 1921), and so was not incorporated in either the CIÉ or UTA. However, mounting losses saw the network purchased jointly by the Irish and British governments on 1 September 1953. It was run as a joint board, independent of the CIÉ and UTA, until 30 September 1958 when it was dissolved and the remaining stock split equally between the two railways.