In many parts of Bulgaria it's necessary - or easier - to travel by bus ( avtobus or, colloquially, reis ), especially in the Rhodopes and the Pirin, where few of the attractions are accessible by train. Each town of any size has a bus station ( avtogara ), or sometimes two, as buses operated by private companies may use another depot (often just a parking lot); in cities, this duplication can result in three or four terminals. Since the buses run by private companies are usually newer than the vehicles owned by municipalities, they tend to be more comfortable and faster, particularly if the route follows a highway through the lowlands rather than mountain roads. The drawback is that infomation on schedules is harder to obtain as few companies post timetables, so that you may have to ask at several kiosks to get the full picture. In some cases the vehicles are minibuses , and leave as soon as they're full; such services are called marshrutni taxi .