Bus travel may not be as glamorous as electrified railways, funiculars, and aerial cablecars, but it represents a vital link in Switzerland's tightly integrated public transportation system. After all, not every town or village can be on a railroad line--especially if it's halfway up a mountainside or tucked into a corner of a remote valley.The Autobus volume of the Swiss Official Timetable has more than a thousand timetables for bus lines throughout Switzerland, including many Postal Bus routes operated by Swiss Post. These bright yellow buses, with their triple-redundant brake systems and distinctive three-tone horns, are seen all over the country. Look for them at train stations and post offices, where local citizens use them for commuting, visiting Grandma, or heading for town to buy the latest Metallica album.