I am currently working on a project, which I hope to unveil on this website by the end of the year and whilst researching for same, I needed to look at the historic OS maps for Northern Ireland online.
Unlike the OSI, the NI historic maps are harder to find (tucked away in a corner of the NI Government web portal) and the user interface is not as user friendly as that of the OSI. However, where the OSNI kicks ass is that multiple versions of the 6″ map for any given area at different time frames are online.
I was aware from my railway studies that there had been a railway station in Coleraine west of the River Bann, which was the eastern terminus of the Londonderry & Coleraine Railway. This subsequently closed after a railway bridge over the Bann was built, allowing trains access to the east side of the river.
Whilst carrying out research for this project, I noticed that the first railway connection to connect the east and west banks of the Bann at Coleraine crossed over the line into this station and therefore would have created either a railway square crossing, or a railway over railway bridge – the former were very rare (2 cases on public railways and another 2 of an industrial railway crossing a public railway) and the latter not that common (about a dozen cases in Ireland of a public railway over a public railway).
Thanks to the OSNI maps on the NI Government Portal, I have been able to determine that this was another example of a railway bridge over a railway that had heretofore escaped my attention.
Unlike the OSI website, it is not possible to link directly to a specific location on the OSNI maps – however, upon accessing the link above, entering in the co-ordinates “284630,432860” in the X-Y coordinates box to the left of the map will bring you to the location in question