The company's sub-contracting charges in the April-June quarter plummeted to Rs 427.68 crore from Rs 1,439.43 crore in the same period, last fiscal, Reliance Infrastructure said in a regulatory filing to the stock exchanges.
The company had posted a net profit of Rs 415.20 crore in the corresponding quarter of the last financial year.
Reliance Infrastructure's other income rose to Rs 397.60 crore from Rs 293.48 crore, last fiscal.
Mumbai Metro's operations, a service operated by Reliance Infrastructure through its special purpose vehicle Mumbai Metro One Pvt Ltd, started in the first week of June this year.
As many as 2.4 lakh commuters travelled on the first day of commencement of operations.
Shares of the company closed at Rs 766.50, down 2.58 per cent on the BSE.