Answer: Czechia
Notes: In 2023, Czechia had the highest railway network density in Europe with 123.2 metres of railway line per square kilometre. Belgium followed with 119.2 m/km², Germany with 109.5 m/km², and Luxembourg with 104.8 m/km². Czechia’s dense network originated from construction during the nineteenth-century monarchy period and further expansion under the communist regime.
