Kamayani Express - Late आना है काम तुम्हारा लेकिन मैं फिर भी हूँ तुम्हारा दीवाना - Aman

This has officially they have written in their nfr construction website

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link plz

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Here the details of Northern Frontier Railways construction work. This is upto May 2020 Progress report.

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patch doubling kya hota hai?

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A discrete way. Means suppose if you need to double a to b then b to c then c to d but b to c suppose time consuming like tunneling or bridge construction then railway trying to do a to b and c to d patch doubling. If I am wrong then any rail fan can rectify this.

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