Islandbridge Junction, located just west of Heuston Station in Dublin City, was established in the 1880s when the GSWR built a line from the main Dublin-Cork line to Glasnevin Jnc in the north of the city to connect with the MGWR's freight line to the North Wall yards. Today, the line between Islandbridge Jnc and Glasnevin Jnc, 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 Jnc while Heuston was been rebuilt, today the platform is out of use. Just beyond the platform, the line crosses the River Liffey on a girder bridge before entering the tunnel.