red signal. On 21 August 2015, a gunman attacked passengers on an Amsterdam–Paris train near Arras. The incident was treated as a terrorist attack. Three passengers along with the gunman received non-fatal injuries. See also Cologne–Aachen high-speed railway HSL 1 HSL 2 HSL 3 HSL 4 HSL-Zuid LGV Nord Train categories in Europe IZY – Thalys low-cost service References Further reading High-speed trains High-speed rail in Belgium Named passenger rail services of France High-speed rail in the Netherlands High-speed rail in Germany TGV trainsets Electric multiple units with locomotive-like power cars SNCF brands Railway services introduced in 1995 Rail transport brands