Last update 27 October 2020
Additional information is always gratefully received, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the contact link under the Miscellaneous entry in the navigation bar above. Thank you.
Please select a starting letter from the links below:
This listing includes both Northern Ireland Railways/Translink and Iarnród Éireann/Córas Iompair Éireann signals. Instances where a prefix is known but its controlling signal cabin is not are shown at the end of the table.
| Code | Signal Cabin | Note |
|---|
| AD | Adelaide | |
| AN | Antrim | |
| AE | Athlone | |
| AE R | Distant signals | |
| XG | Level crossing signals | |
| XM | ||
| AY | Athy | |
| BA | Ballina | |
| BY | Ballybrophy | |
| NBX | Ballycoskerry Crossing | Automatic signals 'numbered' NBX DS and NBX US |
| BA | Ballymena | |
| BY | Ballymoney | |
| BR | Bangor | |
| CL | Belfast Central | |
| CLR | Banner repeater signals | |
| CLRR | ||
| BN | Bellarena | |
| BH | Birdhill | |
| BWX | Bishopswood Crossing | Automatic signal 'numbered' BWX UD |
| BG | Bleach Green | |
| BN | Booterstown | |
| BR | Bray | |
| C | Castlebar | |
| R | Distant signals | |
| CS | Carrickfergus | |
| CR | Carrick-on-Suir | |
| CK | Castlerock | |
| RC | Charleville | Prefix derived from Irish Gaelic name 'Rathluirc' |
| RC R | Distant signals | |
| CY | Cherryville Junction | |
| CY R | Distant signals | |
| CR | Church Road | Downgraded to shunt frame 7 July 1991 |
| CA | Clara | |
| CA R | Distant signals | |
| XA | Ashfield Crossing | |
| CL | Clonmel | Semaphore signals, prefix not carried |
| CL | Clonsilla | Also manages Dublin West (DW) and Maynooth (MN) signals |
| CN | Clonydonnin | |
| CN R | Distant signals | |
| CY | ||
| CE | Coleraine | |
| CY | Connolly | New panel installed 22 May 1983 |
| BN | Booterstown signals | |
| BR | Bray signals | |
| CY-GH | Geashill signals | |
| CY-PE | Portlaoise signals | |
| DK | Dalkey signals | |
| DL | Dún Laoghaire signals | |
| HJ | Howth Junction signals | |
| HT | Howth signals | |
| KR | Killester signals | |
| ND | North Dublin (Malahide) signals | |
| C | Connolly Central | |
| EW | Connolly East Wall | |
| S | Connolly Station | |
| CW | Connolly West | |
| WR | Connolly West Road | |
| WR R | Distant signals | |
| CK | Cork | |
| CK R | Distant signals | |
| CE | Cork East uncertain, near Midleton | |
| DK | Dalkey | |
| DA | Drogheda | |
| DN | Dromkeen | |
| DN R | Distant signals | |
| DC | Dublin Central | |
| DS | Dublin Docklands | |
| DN | Dublin North | |
| DL | Dun Laoghaire | |
| DD | Dundalk | |
| FL | Fingal | |
| XF | Foynes | Level crossing signals |
| GL | Galway | |
| GL R | Distant signals | |
| XG | Level crossing signals | |
| GS | Greystones | |
| HN | Heuston | Named Dublin Kingsbridge to 9 April 1966 |
| HN BR | Banner repeater signals | |
| HN R | Distant signals | |
| HK | Heuston-Kildare main line | |
| HJ | Howth Junction | Named Junction to 30 June 1912 |
| KY | Kilkenny | |
| KN | Killagan? | |
| KR | Killester | |
| KJ | Killonan Junction | |
| KJ R | Distant signals | |
| KN | ||
| KG | Knockcroghery | |
| LJ | Lagan Junction | |
| LR | Larne Harbour | |
| LN | Larne Town | |
| PL | Laois Train Care Depot | |
| LY | Liffey Junction | |
| LJ | Limerick Junction | |
| LJ R | Distant signals | |
| LJ S | Limerick Junction (South) | |
| LK | Limerick Station | |
| LK R | Distant signals | |
| LKCK | Limerick Yard | |
| LF | Lisduff | |
| LF R | Distant signals | |
| LNX | Lisnolan level crossing | Automatic signal 'numbered' LNX DS |
| LY | Londonderry | |
| MH | Malahide | |
| ND | Malahide (North Dublin) | |
| MW | Mallow | Unclear whether this was previously North or South signal cabin |
| MW R | Distant signals | |
| MJ | Manulla Junction | |
| R | Distant signals | |
| ML | Code in use 2015 | |
| MN | Maynooth | |
| ML | Mayo Line (Athlone to Westport and Ballina) | |
| ML R | Distant signals | |
| XM | Level crossing signals | |
| XX | ||
| R | Moathill Crossing | Distant signals |
| MR | Moira | |
| MB | Muine Bheag | |
| NN | Navan | |
| PD | Portadown | |
| PN | Portarlington | |
| PN R | Distant signals | |
| PH | Portrush | |
| RP | Rathpeacon | |
| RP R | Distant signals | |
| - | Roscrea | Semaphore signals, no prefix |
| RL | Rosslare Line (Greystones to Rosslare) | |
| RS | Rosslare Strand | |
| RS R | Distant signals | |
| SL | Sligo Line (Maynooth to Sligo) | |
| TK | Templepatrick? | |
| TN | Thomastown | |
| TNX | Thomastown Level Crossing | Automatic signals 'numbered' TNX DD and TNX UD |
| TS | Thurles ECP | |
| TS R | Distant signals | |
| TY | Tipperary | |
| TL | Tralee Line (Mallow/Killonan Junction to Tralee) | |
| TL | Tullamore | |
| TE | ||
| TL R | Distant signals | |
| TE R | ||
| XA | Level crossing signals | |
| WD | Waterford Central | |
| WL | Waterford Line (Cherryville Junction to Waterford West) | |
| WL R | Distant signals | |
| XW | Level crossing signals | |
| WT | Waterford West | |
| WT R | Distant signals | |
| WD | Whitehead | |
| YR | York Road | |
| CLX | Unknown level crossing near Ballybrophy | Automatic signal 'numbered' CLX DD |
| FL | Unknown near Howth Junction/Malahide | |
| FP | Unknown near Glasnevin Junction/Heuston | |
| FP | Unknown near Waterford |