ADAI stands for Additional Deputy Comptroller and Auditor General (Railways). This is the designated audit officer for the Railways, functioning under the CAG. Under Rule 6, Railway accounting authorities must consult ADAI before exercising their delegated powers to open new account sub-heads.
Source: GAR Rule 6
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This answer is for informational purposes only and does not constitute legal advice. Always refer to the original rules and consult competent authorities for official interpretation.