At present Irish Rail commuter railcars aren't fitted with UK safety equipment, so aren't allowed to operate cross border. Only a limited number of NIR cars are equipped for operation south of the border, so similar story there. As far as I know, the safety gear is due to be standardised across Europe in the next few years, which would make this problem disappear.
There is talk of the Enterprise going hourly, but no indication of when that might happen.
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