Norway's state railway, NSB (Norges Statsbaner), has two train stations downtown -- Oslo Sentralstasjon (Oslo S), and a station at Nationaltheatret. Long-distance domestic and international trains arrive at and leave from Oslo S Station. Suburban commuter trains use one or the other station. Commuter cars reserved for monthly-pass holders are marked with a large black "M" on a yellow circle. Trains marked "C," or InterCity, offer such upgraded services as breakfast and office cars -- with phones and power outlets -- for an added fee.
NSB Customer Service (815/00-888).