The civil work on both the lines have already commenced but if the rolling stock is not available then it would be difficult to complete the project on time.
"We want to raise funds to the tune of Rs 5,000 crore for rolling stock for both the projects from international agencies. We had approached the state government to become a guarantor but it has not yet agreed for the same," a MMRDA official said.
More From This Section
The rolling stock includes not only trains, but also tracks, signalling systems, among others.
Banks are ready to provide loans directly to the MMRDA, but the Union government's regulations do not allow a direct borrowing, the official said.
According to the official the Department of Economic Affairs (DEA) has been approached to make amendments in the regulations so that funds can be borrowed directly, without Maharashtra government's support as a guarantor.
The borrowing is likely to come from the Asian Development Bank.
According to the schedule, bids for buying rolling stocks should have been floated by now, but it hasn't been done due to want of funds as the debt-ridden state government doesn't want an additional liability.
The civil works for Metro 2A and Metro 7 routes are expected to be through by early 2018.
The Dahisar-DN Nagar 2A metro is planned to be 18.5-kms with 17 stations at an estimated cost of Rs 6,410 crore. Whereas, Dahisar East-Andheri East 7 metro will be 16.5-kms long with 16 stations and the estimated price has been pegged at Rs 6,208 crore.