/ /1857 | Portadown and Dungannon Railway Renamed Portadown, Dungannon and Omagh Railway. |
02/09/1861 | Portadown, Dungannon and Omagh Railway Portadown and Dungannon Railway extended from Dungannon [2nd] to Omagh. |
/ /1862 | Portadown, Dungannon and Omagh Railway Omagh Market Branch opened. |
/ /1874 | Dungannon and Cookstown Railway Incorporated. Supported by Ulster Railway and Portadown, Dungannon and Omagh Railway. |
/ /1876 | Portadown, Dungannon and Omagh Railway Absorbed by Ulster Railway. |
/ /1879 | Dungannon and Cookstown Railway Opened from Dungannon Junction (Portadown, Dungannon and Omagh Railway) to Cookstown [DandCR], alongside the existing Cookstown [BandNCR] station. |
/ /1883 | Londonderry and Enniskillen Railway
Portadown, Dungannon and Omagh Railway Omagh station rebuilt. |
/ /1902 | Portadown, Dungannon and Omagh Railway Doubled from Portadown Junction to Annaghmore. |
/ /1903 | Portadown, Dungannon and Omagh Railway Doubled from Annaghmore to Trew and Moy. |
/ /1906 | Portadown, Dungannon and Omagh Railway Doubled from Dungannon to Donaghmore. (The line between Trew and Moy and Dungannon could not be doubled due to the single track through Dungannon Tunnel .) |
/ /1936 | Portadown, Dungannon and Omagh Railway Singled from Dungannon to Donaghmore. |
/ /1959 | Portadown, Dungannon and Omagh Railway Singled from Trew and Moy to Portadown Junction. |
04/01/1965 | Dungannon and Cookstown Railway Line closed with closure from Coalisland to Dungannon Junction. Planned closure of Portadown, Dungannon and Omagh Railway delayed. |
15/02/1965 | Portadown, Dungannon and Omagh Railway
Londonderry and Enniskillen Railway Closure from Portadown Junction to Londonderry [Foyle Road] via Omagh. Traffic from Dublin for Donegal diverted via Coleraine instead. |