Here is the list of top 10 largest railway networks in the world.
1) United states- 250,000 km
2) China-100,000 km
3) Russia 85,500 km.......................
Know more about Indian railways @ https://civilscholar.blogspot.in/2016/09/indian-railways-facts.html
Civil Scholar is a Blog by Aravind Samala on Construction, Environment, Technology, Trends and Innovation.