The principal road running through Roskilde is Danish national road 21, better known as Holbæk Motorway, which connects the city to the capital in the east. Roskilde has a four-platform railway station. Its seven tracks serve as a central hub connecting western and southern Zealand, the islands of Falster and Lolland, and Jutland to Copenhagen. Also within the municipality is the Trekroner station, serving Roskilde University and the developing residential areas to the east of Roskilde. Roskilde Station is the oldest railway station in Denmark still in operation and the first to be built of stone. The first train arrived from Copenhagen on 26 June 1847.