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However broad gauge remained the most prevalent gauge across the Indian subcontinent, reaching right across from [[Iran]] to [[Burma]] and [[Kashmir]] to [[Tamil Nadu]]. After [[Independence]], the [[Indian Railways]] adopted {{RailGauge|66}} as the standard Indian Gauge, and began [[Project Unigauge]] to convert metre gauge and narrow gauge to broad gauge. Even the newest rail projects in India, such as the [[Konkan Railway]] and the [[Delhi Metro]] use broad gauge. There was a move to use [[standard gauge]] for the Delhi Metro, but the decision was made to use broad gauge to maintain compatibility with the rest of the rail network in India.
The new Bangalore Metro Lines will be on [[standard gauge]] and similarly Mumbai & Hyderabad Metro will also be on [[standard gauge]].
In the early days of rail transport in the [[United States]], railroads were built out of cities into the hinderland, and systems did not connect. Each builder was free to choose its own gauge, although the availability of British-built locomotives encouraged some railroads to be built to standard gauge. As a general rule, southern railroads were built to one or another broad gauge, while northern railroads that were not standard-gauge tended to be narrow-gauge. When American railroads' track extended to the point that they began to interconnect, it became clear that a single nationwide gauge would be a good idea. Conversion was slow until after the [[American Civil War]], when destroyed tracks were rebuilt to standard gauge. Now, the only broad-gauge rail systems in the United States are city transit systems.
== Russian Broad Gauge ==
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