Aitchison was sworn in on 5 April 2023 as Minister for Regional Transport and Roads.

[5] The portfolio of Minister for Railways was created in the Holman Nationalist ministry and had operational responsibility for the railways while the Secretary for Public Works had responsibility for authorising expenditure on any new lines or extensions that exceeded £20,000.

The separation however was only at a department level as the portfolio was always held by the Secretary for Public Works.

The ministerial office was not filled and instead the railways department was administered by the Colonial Treasurer.

[7] The operation of railways remained the responsibility of the Treasurer in the third Lang ministry until 22 March 1932.