Islandbridge Junction, located just west of Heuston Station in Dublin City, was established in the 1880s when the Great Southern & Western Railway built a line that diverged north towards Glasnevin from their main Dublin to Cork line. The line to Glasnevin ran north of the city to connect with the Midland Great Western Railway's goods line to the North Wall yards. Today, the line between Islandbridge Junction and Glasnevin Jct, which incorporates the 757 yard long tunnel underneath the Phoenix Park, remains in use for freight and transfer workings to North Wall and Connolly Station. In recent times, a platform No.10 of Heuston Station was established beside Islandbridge Junction while Heuston Station was been rebuilt, but today the platform is out of use. Just beyond the platform, the line crosses the River Liffey on a lattice bridge before entering the tunnel.