What is the length of Indian Railways network, according to Railway Yearbook 2019-20?

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1. The Railway Yearbook 2019-20 reports the total route length of Indian Railways as $67{,}956\ 	ext{km}$.  
2. Among the given options, (1) corresponds exactly to $67{,}956\ 	ext{km}$.  
3. Therefore the correct choice is option (1), i.e., (a).  
FINAL_ANSWER: a

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