timetables was the InterCity network of 1979, which provided hourly long-distance services between cities. In 1982, a nationwide integrated regular timetable was introduced in Switzerland, which covered all but a few railway and bus lines. The base frequency was once an hour. The system was improved every two years and resulted in the Rail 2000 project of Swiss Federal Railways. Switzerland Services on the Swiss railway network are integrated with one another and with other forms of public transport. Unlike its larger European neighbors, compact Switzerland has not developed a comprehensive high-speed rail network, with the running speed on its few stretches of relatively high-speed line being . Instead, the priority is not so much the speeding up of trains between cities but the reduction of connection times throughout the nodal system. Swiss Federal Railways have adapted their infrastructure in such a way that journey times on main lines between hubs are multiples of 30 minutes so that on the hour or half-hour, all trains stand in the main stations at the same time, thus minimising connection times. Indeed, the above-mentioned Mattstetten–Rothrist line reduces journey times from Bern to Zurich from 72 minutes to 56 minutes in keeping with the clock-face scheduling. The Swiss approach is sometimes called "as fast as necessary" with a schedule being written mandating specific travel times and infrastructure later upgraded in line with the proposed schedule. This was the main idea behind the Bahn 2000 project and has also been used for the passenger travel through the NRLA tunnels. However, on some single tracked lines the timetables may be 30/30 or 60/60 minutes, with the actual timetables being asymmetrical (such as 20/40 minutes), because passing loops are not positioned ideally, or alternate connections at either ends have to be reached. Germany Since the mid-1990s, the states of Germany are responsible for Regional Rail Provision and have introduced integrated timetables, running hourly or every two hours, such as Allgäu-Schwaben-Takt (commencing in 1993), Rheinland-Pfalz-Takt (1994) and NRW-Takt (1998). Local transport associations have introduced regular timetables with base frequencies of 20 or 30 minutes, which are partially changed to 10 or 5 or even 15 or 7.5 minutes when locations are served by overlapping multiple lines. In some areas, local buses are also integrated, such as RegioTakt in Northrhine-Westphalia and in parts of Lower Saxony. These developments have led to "integrated timetable islands", which all adhere to the