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Originally Posted by PLUMB LOCO
There are absolutely no safety problems on single lines and while they may limit capacity the cost of double tracking would not be justified and in many cases e.g. Bray Head, it is not practical.
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Bray Head is a bit like the Boyne Viaduct, it must be single track, only the entrance and exit around the viaduct are double-track. For 95% of the single track lines in the country, double-track lines can be built. They can also increase the frequency of the routes. Maybe it will take a crash and lives lost, in order for the money to be spent.
That's the priority for IE, not building huge stations on the Kildare Route project that are designed for 10 times the capacity they currently have, and building 2 branch lines outside Inchicore that are never used.
Because of the single track on the new CART route, there can only be trains at the rate of one an hour. Double-track them, and you can have as many as you like.