The correct sequence of the following countries in terms of total railway length in the world in descending order is :

The answer is D, and the order is USA, Canada, India, Germany. The USA has the largest network by far, at roughly 2.2 to 2.5 lakh km of track in older compilations. Canada is next in the older data sets this question was based on, with total track length around 75,000 km or more. India follows with about 63,000 to 65,000 km. Germany comes last among these four, at roughly 35,000 to 38,000 km.

• Option A is wrong because Germany and India are far too small to sit ahead of the USA.
• Option B is wrong because Germany is nowhere near the USA or Canada in size.
• Option C is wrong because India is not larger than the USA, and Canada is not smaller than Germany.

The concept is simply the comparison of national rail networks by track or route length, a standard static-geography fact. For Mains, it links to infrastructure, connectivity, and the debate on railway modernisation in India.

Note that current figures differ. Recent route-length data puts India ahead of Canada, so the order has changed. Answer the question as framed, using the figures of its time.

Trap: Aspirants often rank India above Canada based on current figures and then pick the wrong option, or they mix up track length with route length.