As per Indian Railways, the broad gauge has been classified into _____ groups based on _____ criteria.

As per Indian Railways, the broad gauge has been classified into _____ groups based on _____ criteria. Correct Answer Five, speed

The broad gauge has been classified into five different groups based on the speed of the train. The different groups are: Group A; Group B; Group C; Group D Special and Group E Special lines.
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Related Questions

Why did Indian Railways convert all the rail lines to broad gauge instead of standard gauge?
The standard length of rail for Broad Gauge and Meter Gauge are respectively