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"Peaceful unification is much harder than unification by force," she added.

"At the end of the day, to me that was more so about the unification of the city," he said.

Speaking after his election was confirmed in the early hours of Monday, Murphy said he would "advance the debate on Irish unification" and bring a "northern perspective".

In her speech, she said there was a need for unification across the train operators and Network Rail, which manages the railway infrastructure.

The first, with o.rigins in the latter stages of World War II, concerned proposals for service unification, which the Navy opposed for fear of losing prerogatives and capabilities to central authority.