Portadown, Dungannon and Omagh Junction Railway
The Portadown , Dungannon and Omagh Junction Railway ( PD&O ) was an Irish gauge railway in County Armagh and County Tyrone , Ulster , Ireland ( now Northern Ireland ) . 
<triplet> Portadown, Dungannon and Omagh Junction Railway <subj> Irish gauge <obj> track gauge <triplet> County Armagh <subj> County Tyrone <obj> shares border with <subj> Northern Ireland <obj> located in the administrative territorial entity <triplet> County Tyrone <subj> County Armagh <obj> shares border with <subj> Northern Ireland <obj> located in the administrative territorial entity