Why did Indian Railways convert all the rail lines to broad gauge instead of standard gauge?

Why did Indian Railways convert all the rail lines to broad gauge instead of standard gauge? Correct Answer Almost 50% of the rail lines in India were of broad gauge in the year 1992

In the year 1992 (when the Project Unigauge started), almost 50% of the Indian rail lines were of broad gauge, 43% of metre gauge and remaining 7% of narrow gauge. Adopting a different gauge apart from these would mean converting all the existing lines. This was economically impossible to achieve. So, broad gauge was chosen which meant converting only metre and narrow gauge.

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The standard length of rail for Broad Gauge and Meter Gauge are respectively