The peak weekend for Christmas shopping, I believe, tends to be the first weekend in December. The 30th November/1st of December is uncomfortably close to that.
Its not the end of the world, the numbers travelling on DART at weekends these days is fairly modest in any event although I would expect next weekend to be busier than many of the alternatives in January/February.
It could be Irish Rail have some money to spend which won't be available next year. It could be that they need to deal urgently with defective infrastructure.
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