The Netherlands is densely populated and urbanised, and train services are frequent. There are two main types of trains: Intercity trains and Sprinter (or sometimes 'Stoptrein') trains which stop at all stations. An intermediate type 'Sneltrein' is found in a few places. All these types of train have the same prices. Also, there are high-speed trains called 'Fyra' between Amsterdam and Breda, which are more expensive. Travelling all the way from the north of the country (Groningen) to the south (Maastricht) takes approximately 4 hours. Most lines offer one train every 15 minutes (every 10 min during the rush hours), but some rural lines run only every 60 min. Where more lines run together, the frequency is, of course, even higher. In the western Netherlands, the rail network is more like a large urban network, with up to 12 trains per hour on main routes. The Nederlandse Spoorwegen (NS)  operates most routes.