Tunnels in Ireland

Bray Head Tunnel No. 1 (Connolly Station, Dublin to Rosslare Europort - 300 yards)
Bray Head Tunnel No. 2 (Connolly Station, Dublin to Rosslare Europort - 143 yards)
Bray Head Tunnel No. 3 (Connolly Station, Dublin to Rosslare Europort - 210 yards)
Bray Head Tunnel No. 4 (Connolly Station, Dublin to Rosslare Europort - 1,084 yards)
Castlerock (Coleraine to Derry - 667 yards)
Cork (Heuston Station, Dublin to Cork Kent Station - 1,355 yards)
Cross Gunns (Liffey Junction to North Wall (MGWR) - 177 yards)
Downhill (Coleraine to Derry - 301 yards)
Enniscorthy (Connolly Station, Dublin to Rosslare Europort - 405 yards)
Ferrycarrig (Connolly Station, Dublin to Rosslare Europort - 296 yards)
Killurin (Connolly Station, Dublin to Rosslare Europort - 89 yards)
Lisburn Road, Belfast (Belfast Central Junction to Belfast Central - 107 yards)
Phoenix Park (Islandbridge Junction to Glasnevin Junction - 757 yards)
Rathdrum No. 1 (Connolly Station, Dublin to Rosslare Europort - 190 yards)
Rathdrum No. 2 (Connolly Station, Dublin to Rosslare Europort - 25 yards)
Rathdrum No. 3 (Connolly Station, Dublin to Rosslare Europort - 50 yards)
Snow Hill (Waterford to Rosslare Strand - 217 yards)
Sorrento Tunnel, Dalkey ((Connolly Station, Dublin to Rosslare Europort - 160 yards)
Whitehead (Belfast Central to Larne Harbour - 157 yards (Down line only))

Barnagh (Ballingrane Junction to Tralee - 100 yards)
Brabazon Tunnel (Connolly Station, Dublin to Rosslare Europort - ?? yards, bypassed by Bray Head No. 1)
Drung Hill No. 1 (Farranfore to Valentia Harbour - 120 yards)
Drung Hill No. 2 (Farranfore to Valentia Harbour - 91 yards)
Dungannon (Portadown to Dungannon - 814 yards)
Durrow (Waterford to Dungarvan - 434 yards)
Gogginshill (Ballinhassig) (Cork to Bandon - 906 yards)
Kilpatrick (Innishannon) (Cork to Bandon - 133 yards)
Lisummon (Newry to Armagh - 1759 yards)
Loughgilly (Newry to Armagh - 365 yards)
Mount Elliot (Macmine Junction to New Ross - 748 yards)
Newport No. 1 (Westport to Achill - 88 yards)
Newport No. 2 (Westport to Achill - 133 yards)
Passage (Cork to Passage - 535 yards - only narrow gauge rail tunnel)
Prospect Hill, Galway (Galway to Clifden - 89 yards)
Queen's Bridge (Belfast East Bridge Street Junction to Dufferin Dock Junction - 131 yards)