Its partly costs and partly the ability of the metro concept to be interoperable with the Luas.
In my opinion I believe the Red line and Lucan line and possible Rathfarnham - Liffey Junction lines (ie on street) should be 2.4 and tramlike while all other lines should be at least 2.65 if not 2.8m in width.
Length or frequency are not the issues here - its width.
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