Last update 26 May 2021
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 | Level crossing signals | |
| 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 | Banner repeater signals | |
| 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 | Level crossing signals | |
| 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 | Distant signals | |
| 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 |