'The distance between rails in broad gauge is 1.676 metres', which gauge is being referred to here?

Broad gauge

On the basis of the width of the track of the Indian Railways, three categories have been made:

Broad gauge: The distance between rails in broad gauge is 1.676 metres. The total length of broad gauge lines was 63950 km (2019-20).

Metre gauge: The distance between rails is one metre. Its total length was 2402 km (2019-20).

Narrow gauge: The distance between the rails in this case is 0.762 metres or 0.610 metres. The total length of the narrow gauge was 1604 km (2019-20). It is generally confined to hilly areas.