|
| 1935 | 2007 | ||
|
| Number of gauges | (km2 per gauge) | Number of gauges | (km2 per gauge) |
| Irish Republic | 189 | 371.9 | 474 | 148.5 |
| N. Ireland | 68 | 207.8 | 103 | 137.2 |
| Britain | 3790 | 60.9 | 2665 | 86.6 |