Its not illegal to use two tickets to complete the journey, it is illegal to rebook en route and continue by the same train
It is completely fine to use two tickets where the value of the two tickets is the same or more than the actual fare.
So for instance I have done Newry Connolly and exiting platform 1 take the right turn at the door wave my monthly dublin area ticket at the inspector and head over the P5, two tickets one journey
Irrespective of the rules if you have to change enroute there is nothing IE can do to stop you buying a ticket to/from the change point
So cheapest way to Arklow is actually to get a ticket to Greystones which is only 3.70 single and then onwards to Arklow, now that is against the rules unless you arrive and leave Greystones by DART exit the station and then re enter thus having broken the journey
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