To determine which country boasts the largest rail network in terms of total track length, let's assess the information on the available options. A rail network is an essential part of a nation's infrastructure, facilitating goods and passenger movement, fostering economic growth, and representing significant technological and engineering achievements. Here's a quick analysis of the countries presented:
- India: India has an extensive rail network, among the largest in the world, covering vast distances and serving millions daily. However, while notable, it does not surpass the largest in terms of total length.
- China: China has rapidly expanded its rail infrastructure, including high-speed rail, over recent decades, becoming one of the most advanced. While it poses a significant global presence, it is still slightly behind the largest.
- U.S.A: The United States of America leads the world with the most extensive rail network. This vast network supports vast freight operations and connects diverse parts of the continent, making it an integral part of national commerce.
- U.K.: The United Kingdom has a historically significant rail system, but it is not as extensive as those of the other large nations.
Therefore, the correct option is U.S.A, which possesses the largest railway network globally, providing a crucial backbone for both commercial and passenger transport across its vast territories.