They are Missamari-Tenga-Tawang (378 km), Bilaspur-Manali- Leh (498 km), Pasighat-Tezu-Rupai (227 km) and North Lakhimpur-Bame-Silapathar (249km), Minister of State for Railways Manoj Sinha said.

In a written reply, he said, "The Railway Ministry has requested the Defence Ministry to convey approval to carry out final location survey at a cost of Rs 345 crore and provide the necessary funds."

The time of completion and cost, however, cannot be ascertained till completion of the final location survey and detailed geo-technical studies and consequent sanction of the project, he added.

To a related question, he said no strategic line along Pakistan border has been identified by the Defence Ministry in the first phase.

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