Hello, I'm an expert in transportation systems with a focus on railways. When it comes to the largest rail network in the world, the answer is quite straightforward.
China is the country with the largest rail network in the world. As of my last update, China's railway network spanned over
130,000 kilometers (over 80,000 miles), which includes both high-speed and regular rail services. The Chinese rail system is known for its extensive coverage and rapid expansion, particularly in the domain of high-speed rail.
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