The group, which is separately bringing judicial review proceedings over the Northern Ireland Executive and communities minister’s failure to adopt an Irish language strategy, applied to intervene after seeking and receiving consent from the infrastructure minister, Liz Kimmins.

Conradh na Gaeilge, represented by KRW LAW partner Niall Murphy, supports the minister’s decision to erect dual-language signage at the station, which is being challenged in a judicial review by loyalist activist Jamie Bryson.

Mr Justice McAlinden did not make a decision on the proposed intervention at a hearing in the High Court yesterday.

However, he requested the ministers involved to consider the case further, and proposed seeking input and expertise from the newly-appointed Irish language commissioner.

Ciarán Mac Giolla Bhéin, president of Conradh na Gaeilge, said: “Conradh na Gaeilge welcomes the court’s direction today to grant us access to the papers involved in the case, prior to our intervention being heard.

“More importantly, we believe Justice McAlinden’s proposal to seek the input and expertise of the newly appointed Irish language commissioner to be sensible and prudent.

“We would anticipate that the Irish language commissioner, who under the legislation will develop ‘best practice standards’, will come to the conclusion that dual-language signage in shared spaces is a best practice model enjoyed and enshrined in other countries with similar circumstances, ultimately supporting the minister’s original position.”

Mr Murphy added: “Our application to intervene in this case on behalf of Conradh na Gaeilge, was to support the decision to erect dual-language signage in Grand Central Station, and to assist the court’s comprehension of what we consider to be a positive duty on the Department under various international treaties.

“The decision sits well within the letter and spirit of the Good Friday Agreement, calling for ‘resolute action to promote the language’ and to ‘facilitate and encourage the use of Irish in speech and writing in public life’.

“We welcome the decision by the court to seek the informed opinion of the Irish language commissioner, which in time, will likely make this application redundant.”

Conradh na Gaeilge has also been supported by the Committee on the Administration of Justice (CAJ) in the case.