Irish Tunnel

This idea is pretty much self-explainatory, a road or rail tunnel connecting Scotland to Northern Ireland, similar in idea to the Channel Tunnel or the Tyne Tunnel.

I’ve had the idea floating around in my head for years, and other people have had similar ideas too.

Prime Minister Boris Johnson has been proposing a bridge to do the job, but I feel a tunnel would be a much better option as it would avoid issues with high-sided vehicles getting blown over when the weather gets a bit frisky, as well as avoiding vision problems caused by fog.

Apparently ideas for doing this date back to as far as when the Forth Bridge was constructed, with others mentioned on Wikipedia also.

My first option is for a simple 21-mile tunnel from near Port Patrick in Scotland (to the west of Stranraer) that spits people out into Northern Ireland somewhere between Groomsport and Donaghadee near Bangor.

My second option is a combined Bridge and Tunnel arrangement that takes inspiration from the Chesapeake Bay-Bridge Tunnel in the United States [Google Maps].

In this case it runs a mixture of bridges and tunnels from near Ayr to the Isle of Arran, back across to the mainland to the south of Campbeltown, before shooting across to Ireland near Ballycastle.

My 3rd Option is more ambitious, and calls for 2 tunnels. The first tunnel runs from near Whitehaven in Cumbria to the Isle of Man, and the second tunnel runs from the Isle of Man across to Ireland.

One snag I’m aware of is that of a rail based tunnel, and the difference of gauge of track used.
In mainland Britain we of course use “Standard Gauge” (4ft 8.5″), while over in Ireland (including the North) they use a wider 5ft 3″ (1600mm) width standard.

This would likely require the building of an interchange terminal at the Irish end.

UPDATE: Boris Johnson seems to be wanting to do this:

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