The Copenhagen–Ringsted line is a high-speed railway on Zealand, Denmark, connecting Copenhagen via Køge with Ringsted. The line was inaugurated on 31 May 2019, and started operating on 1 June as the first high-speed railway in Denmark. It supports speeds of up to 250 km/h (155 mph) for passenger trains as well as a maximum of 24 trains per hour along its length. As of 2023, the speed limit is 200 km/h.

Køge is a seaport on the coast of Køge Bugt 39 km southwest of Copenhagen. It is the principal town and seat of Køge Municipality, Region Sjælland, Denmark. In 2023, the urban area had a population of 38,588.