I think the sheet on the left is too old to show the railway (it's still shown as under construction!).
It may be that a trip to the Trinity Map Library might be necessary to see a paper map, https://www.tcd.ie/library/map-library/
Ideally what's needed is the OS 1:2500 scale (25") maps, to show the details of running lines, though the six inch might be ok.
If Trinity can't help try NLI--nice day out in Dublin either way
cheers,
Keith