Raw data files available on SonraíOscailteTÉ/OpenDataNI. The files are mainly in geojson file format. I used the Python package pandas to process the data and create the visualisation. The rail way system in Northern Ireland is quite limited but it used to be much more expansive. Fig. 1 shows the current extent of NI Rail
The dataset contains locations of industrial heritage sites across Northern Ireland. Plotting the rail related data points gives Fig 2:
yellow = old stations
red = viaducts
orange = rail bridges over roads and road bridges over rail
purple = level crossing
green = other
The difference in the West is clear - virtually all the old railways in the West have gone. !00% of rail in counties Tyrone and Fermanagh have gone.
The following Wikipedia page lists all closed stations across Ireland.
The following post on my code-examples blog shows the code used to generate the visualisation.
Secondary education in Northern Ireland is divided between grammar and non-grammar schools. Grammar schools use tests to select the most academically gifted students. If you fail the tests you can't go to a grammar school.
The political party Sinn Fein were opposed to selection and in 2011 they abolished the 11+ test. However a number of schools and thousands of parents opposed the move. As a result instead of using one state controlled test there are now several privately run tests used by different schools. Using a dataset from Open data NI I looked for any change in the number of children going to Grammar schools. If Sinn Fein's policy had been successful we could expect to see a drop in the number of children attending grammar schools.
However the above diagram shows a decline in the number of children attending non-grammar secondary schools while grammar school numbers have remained constant.
Based on this analysis my conclusion is that Sinn Fein's policy failed to reduce the grammar school share of the secondary school student numbers.